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Standard ID | GB/T 18877-2020 (GB/T18877-2020) | Description (Translated English) | Organic inorganic compound fertilizer | Sector / Industry | National Standard (Recommended) | Classification of Chinese Standard | G21 | Classification of International Standard | 65.080 | Word Count Estimation | 11,121 | Date of Issue | 2020-11-19 | Date of Implementation | 2021-06-01 | Older Standard (superseded by this standard) | GB/T 18877-2009 | Drafting Organization | Shanghai Research Institute of Chemical Industry Co., Ltd., Shenzhen Batian Ecological Engineering Co., Ltd., Hunan Golden Leaf Zhongwang Technology Co., Ltd., Shandong Lvbaozhu Biological Fertilizer Co., Ltd., Shanghai Institute of Chemical Industry Testing Co., Ltd., Shanghai Huanqiu Engineering Co., Ltd. | Administrative Organization | National Adhesive Standardization Technical Committee (SAC/TC 185) | Regulation (derived from) | National Standard Announcement No. 26 of 2020 | Proposing organization | China Petroleum and Chemical Industry Federation | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | Standard ID | GB 18877-2009 (GB18877-2009) | Description (Translated English) | [GB/T 18877-2009] Organic-inorganic compound fertilizer | Sector / Industry | National Standard | Classification of Chinese Standard | G21 | Classification of International Standard | 65.080 | Word Count Estimation | 12,139 | Date of Issue | 2009-04-07 | Date of Implementation | 2010-05-01 | Older Standard (superseded by this standard) | GB 18877-2002 | Quoted Standard | GB/T 6679; GB/T 8170-2008; GB 8569; GB/T 8573; GB/T 8576; GB/T 8577; GB/T 17767.1; GB/T 17767.3; GB 18382; GB/T 19524.1; GB/T 19524.2; GB/T 22923-2008; GB/T 23349; GB/T 24890-2010; GB/T 24891; HG/T 2843 | Drafting Organization | Shenzhen Batian Ecological Engineering Co., Ltd. | Administrative Organization | Fertilizers and soil conditioners National Standardization Technical Committee | Regulation (derived from) | Announcement of Newly Approved National Standards No. 5, 2009 (No. 145 overall) | Proposing organization | China Petroleum and Chemical Industry Federation | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, China National Standardization Administration Committee | Summary | This Chinese standard specifies the organic machine fertilizer requirements, test methods, inspection rules, marking, packaging, transportation and storage. This standard applies to people and livestock manure, plant and animal residues, agro-processing waste and other organic material through fermentation, after treatment for victims, adding machine made ??of organic fertilizer fertilizer machine. This standard does not apply to add humic acid organic local fertilizer. | Standard ID | GB 18877-2002 (GB18877-2002) | Description (Translated English) | Organic-inorganic compound fertilizers | Sector / Industry | National Standard | Classification of Chinese Standard | G21 | Classification of International Standard | 65.08 | Word Count Estimation | 17,189 | Date of Issue | 2002/11/18 | Date of Implementation | 2003/6/1 | Quoted Standard | GB/T 610.1; GB/T 1250; GB/T 6679; GB/T 7686; GB 7959-1987; GB 8172; GB 8569; GB/T 8573; GB/T 8577; GB 15063-2001; GB/T 17767.1; GB/T 17767.3; GB 18382-2001; HG/T 2843 | Regulation (derived from) | Announcement of Newly Approved National Standards 2009 No. 5 (No. 145 overall) | Proposing organization | China Petroleum and Chemical Industry Association | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China | Summary | This Standard specifies the technical requirements of organic and inorganic fertilizer materials, test methods, inspection rules, marking, packaging, transportation and storage. This Standard is applicable to livestock and poultry manure, animal and plant residues, for field application of a variety of maturity of municipal solid waste (must comply with GB 8172 "urban garbage agricultural control standards" requirement) and other organic materials through fermentation, add inorganic fertilizers made from organic - inorganic compound fertilizer. |
GB/T 18877-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 65.080
G 21
Replacing GB/T 18877-2009
Organic inorganic compound fertilizer
ISSUED ON: NOVEMBER 19, 2020
IMPLEMENTED ON: JUNE 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Technical requirements ... 6
5 Sampling ... 8
6 Test methods ... 9
7 Inspection rules ... 16
8 Marks and quality certificate... 17
9 Packaging, transportation and storage ... 18
Organic inorganic compound fertilizer
1 Scope
This Standard specifies the terms and definitions, technical requirements,
sampling, test methods, inspection rules, marks and quality certificates,
packaging, transportation and storage for organic inorganic compound fertilizer.
This Standard is applicable to the organic inorganic compound fertilizer that is
made by organic materials such as human and livestock manure, animal and
plant residues, scraps of agricultural products processing, through fermentation
and harmless treatment, added with inorganic fertilizer.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 6679, General rules for sampling solid chemical products
GB/T 8170, Rules of rounding off for numerical values & expression and
judgement of limiting values
GB/T 8569, Packing of solid chemical fertilizers
GB/T 8573, Determination of available phosphorus content for compound
fertilizers
GB/T 8576, Determination of free water for compound fertilizers - Vacuum
oven method
GB/T 8577, Determination of free water for compound fertilizers - Karl
Fischer method
GB/T 15063-2020, Compound fertilizer
GB/T 17767.1, Determination of organic-inorganic compound fertilizers - Part
1: Total nitrogen content
GB/T 17767.3, Determination of organic-inorganic compound fertilizers - Part
3: Total potassium content
GB 18382, Fertilizer marking - Presentation and declaration
GB/T 19524.1, Determination of fecal coliforms in fertilizers
GB/T 19524.2, Determination of mortality of ascarid egg in fertilizers
GB/T 22923-2008, Determination of nitrogen, phosphorus and potassium for
fertilizers by auto analyzer
GB/T 22924, Determination of biuret content for compound fertilizers
(complex fertilizers)
GB/T 23349, Determination of arsenic, cadmium, chromium, lead and
mercury contents for fertilizers
GB/T 24890-2010, Determination of chloride content for compound fertilizers
GB/T 24891, Determination of particle size for compound fertilizers
GB 38400, Limitation requirements of toxic and harmful substance in
fertilizers
HG/T 2843, Chemical fertilizer Products-standard volumetric, standard,
reagent and indicator solutions for chemical analysis
NY/T 1117, Water - Soluble fertilizers - Determination of calcium, magnesium,
sulphur and chlorine content
NY/T 1972, Water-soluble fertilizers - Determination of sodium, selenium,
silicon content
NY/T 1978, Fertilizers - Determination of mercury, arsenic, cadmium, lead
and chromium content
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 organic inorganic compound fertilizer
A compound fertilizer containing a certain amount of organic fertilizer.
NOTE: Organic inorganic compound fertilizer includes organic inorganic mixed fertilizer.
4 Technical requirements
4.1 Appearance: Granular or strip product, without mechanical impurities.
divider or quarter method. Reduce into two portions. Subpack into two clean,
dry glass bottles or plastic bottles with ground stoppers. Seal and label them,
indicating manufacturer name, product name, product category, batch number
or production date, sampling date and name of the person who took the sample.
One bottle is for product inspection. The other is stored for two months, for
future inspection.
6 Test methods
WARNING - Potassium dichromate and its solution in the reagent are
oxidizing. Sulfuric acid and its solutions, hydrochloric acid, silver nitrate
solution and sodium hydroxide solution are corrosive. Related operations
shall be carried out in a fume hood. This Standard does not point out all
possible safety issues. The user is responsible for taking appropriate
safety and health measures and ensuring compliance with relevant
national regulations.
6.1 General provisions
The preparation of reagents, water and solutions used in this Standard, when
specifications and preparation methods are not specified, shall be in
accordance with HG/T 2843. Except for appearance and particle size, two test
materials are tested in parallel.
6.2 Specimen preparation
Take a bottle of sample from 5.2. After multiple reductions, take out about 100g.
Grind quickly to pass the 0.50mm or 1.00mm aperture test sieve (if the sample
is wet or difficult to crush, it can be ground to pass the 2.00mm aperture test
sieve). Mix well. Collect in a drying bottle for determination of content. The
remaining samples are used to determine the appearance, particle size,
mortality of roundworm eggs, and the number of fecal coliforms.
6.3 Appearance
Use visual inspection method.
6.4 Organic matter content
6.4.1 Principle
Use a certain amount of potassium dichromate solution and sulfuric acid. Under
heating, the organic carbon in the organic-inorganic compound fertilizer is
oxidized, and the remaining potassium dichromate solution is titrated with
ferrous sulfate (or ferrous ammonium sulfate) standard titration solution. Do a
blank test at the same time. According to the consumption of oxidant before and
V3 - In the blank test, the volume of ferrous sulfate (or ferrous ammonium sulfate)
standard titration solution consumed, in milliliters (mL);
V4 - When measuring the test material, the volume of ferrous sulfate (or ferrous
ammonium sulfate) standard titration solution consumed, in milliliters (mL);
c2 - The concentration of ferrous sulfate (or ferrous ammonium sulfate) standard
titration solution, in moles per liter (mol/L);
0.003 - The molar mass of a quarter of carbon, in grams per millimole (g/mmol);
1.5 - The oxidation correction factor;
w1 - The chloride ion content in the specimen measured according to 6.11, %;
1/12 - The mass fraction of organic carbon equivalent to 1% chloride ion;
1.724 - The empirical conversion coefficient between organic carbon and
organic matter;
m0 - The mass of test material, in grams (g).
The calculation result is expressed to one decimal place. Take the arithmetic
mean of the parallel measurement results as the measurement result.
6.4.6 Precision
The absolute difference of the parallel determination results is not more than
1.0%. The absolute difference between the results of different laboratories is
not more than 1.5%.
6.5 Total nutrient content
6.5.1 Determination of total nitrogen content
Weigh the sample from the samples after milling in 6.2. Conduct according to
the provisions of GB/T 17767.1 or 3.1 of GB/T 22923-2008. The method of GB/T
17767.1 is the arbitration method.
6.5.2 Determination of effective phosphorus pentoxide content
Weigh the sample from the samples after milling in 6.2. Conduct according to
Annex A of GB/T 15063-2020 or GB/T 8573. Take Annex A of GB/T 15063-2020
as the arbitration method.
6.5.3 Determination of total potassium oxide content
Weigh the sample from the samples after milling in 6.2. Conduct according to
the provisions of GB/T 17767.3.
6.7.6 Precision
The absolute difference of the parallel determination results is not more than
0.10pH.
6.8 Determination of particle size
According to GB/T 24891.
6.9 Determination of the mortality of roundworm eggs
According to GB/T 19524.2.
6.10 Determination of fecal coliform group
According to GB/T 19524.1.
6.11 Determination of chloride ion content
6.11.1 Volumetric method
6.11.1.1 Principle
The specimen is in a slightly acidic solution (if the filtrate is colored after the
sample solution extracted with boiling water is filtered, mix the specimen and
the Eschar mixed reagent, and burn to remove combustibles and convert
chlorine to chloride). Add excess silver nitrate solution to convert chloride ions
into silver chloride precipitation. Use dibutyl phthalate to coat the precipitate.
Use ferric ammonium sulfate as indicator. Use ammonium thiocyanate standard
titration solution to titrate the remaining silver nitrate.
6.11.1.2 Reagents or solutions
6.11.1.2.1 All reagents and materials in Chapter 4 of GB/T 24890-2010.
6.11.1.2.2 Silver nitrate solution: 10g/L.
6.11.1.2.3 Activated carbon.
6.11.1.2.4 Eschar mixed reagent: Mix magnesium oxide and anhydrous sodium
carbonate at a mass ratio of 2:1. Grind to be less than 0.25mm. Mix well.
6.11.1.3 Instruments and equipment
6.11.1.3.1 Laboratory equipment is usually used.
6.11.1.3.2 Box-type resistance furnace: The temperature can be controlled at
(500±20)°C.
Weigh the sample from the samples after milling in 6.2. Conduct according to
NY/T 1972.
6.14 Determination of biuret content
Weigh the sample from the samples after milling in 6.2. Conduct according to
the high-performance liquid chromatography in GB/T 22924.
7 Inspection rules
7.1 Inspection category and inspection items
Product inspection includes exit-factory inspection and type inspection.
Appearance, organic matter content, total nutrient content, moisture, particle
size, pH, chloride ion content, and sodium ion content are exit-factory
inspection items. Type inspection items include all items in Chapter 4. Type
inspection is carried out in one of the following situations:
- After formal production, if there are major changes in raw materials and
processes, which may affect the quality of the product;
- During normal production, type inspection is carried out according to the
cycle. Ascaris egg mortality, number of fecal coliforms, biuret, arsenic,
cadmium, lead, chromium, mercury shall be inspected at least once every
six months. Other items in 4.3 are inspected at least once every two years;
- When production is resumed after a long-term stop;
- When the government regulatory agency puts forward the need for type
inspection.
7.2 Batching
The products are inspected in batches. Take one- or two-days' output as a batch.
The maximum batch size is 500t.
7.3 Result determination
7.3.1 The conformity determination for product quality indicators in this
Standard shall use "Rounding value comparison method" in GB/T 8170.
7.3.2 The manufacturer shall carry out exit-factory inspection and type
inspection in accordance with the requirements of this Standard. When all the
inspection items meet the requirements of this Standard, the batch of products
shall be deemed conforming.
7.3.3 If one of the results of the exit-factory inspection or type inspection
......
GB 18877-2009
Organic-inorganic compound fertilizer
ICS 65.080
G21
National Standards of People's Republic of China
Replacing GB 18877-2002
Organic - inorganic compound
Posted 2009-04-07
2012-05-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
The standard Chapter 4, Section 6, Chapter 7 and Chapter 8, 8.1, 8.2 are mandatory, others are recommended.
This standard replaces GB 18877-2002 "organic - inorganic compound fertilizer."
The main difference between this version and GB 18877-2002 are.
--- Further defined the scope;
--- The organic - inorganic compound fertilizer products are divided into type Ⅰ, Ⅱ type and are specified indicators;
--- Moisture increases the GB/T 8576 "Determination of free water for compound fertilizers - Vacuum oven method";
--- "Coliform value" to "fecal coliform", according to GB/T 19524.1 measured;
--- Roundworm eggs mortality according to GB/T 19524.2 measured;
--- Refine the product package label.
From the date of implementation of this standard, organic - inorganic compound fertilizer products should be the implementation of this standard; six months after the date of implementation of the standards on the market
Machine - inorganic compound fertilizer product packaging prohibit labeling GB 18877-2002.
The standard proposed by China Petroleum and Chemical Industry Association.
This standard by the National Standardization Technical Committee and soil conditioners Fertilizers (SAC/TC105) centralized.
This standard was drafted. Shenzhen Batian Ecological Engineering Co., Ltd.
Involved in the drafting of the standard units. National Fertilizer Quality Supervision and Inspection Center (Shanghai), the fat (Heyuan) Agricultural Co., Hunan gold leaf fat
Material limited liability company.
The main drafters of this standard. Liu Gang, Huang Pei Zhao, Fan Bin, Wang Elah, Huang Qingming, Zhuzhao Xia, Chauhan dry.
This standard replaces the standards previously issued as follows.
--- GB 18877-2002.
Organic - inorganic compound
1 Scope
This standard specifies the organic - inorganic compound fertilizer requirements, test methods, inspection rules, marking, packaging, transportation and storage.
This standard applies to people and livestock manure, animal and plant residues, agro-processing waste and other organic materials through fermentation, harmless
After the treatment, the addition of organic and inorganic fertilizers made - inorganic compound fertilizer. This standard does not apply to add humic acid organic - inorganic compound fertilizer.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein
Member. For undated references, the latest edition (including any amendments) applies to this document.
GB/T 6679 General rules for sampling solid chemical products
GB/T 8170-2008 revised value represents about rules and limit values and judgment
GB 8569 solid chemical fertilizers Packaging
Determination of GB/T 8573 available phosphorus content in compound fertilizer
GB/T 8576 free water for compound fertilizers - Determination vacuum oven method
Determination of GB/T 8577 free water content for compound fertilizers - Karl Fischer method
GB/T 17767.1 Organic - inorganic compound fertilizer method - Part 1. total nitrogen content
GB/T 17767.3 Organic - Part 3 inorganic compound fertilizer. the total potassium content
GB 18382 fertilizer identify the content and requirements
Determination of GB/T 19524.1 fertilizers Fecal Coliform
Determination of mortality GB/T 19524.2 fertilizer Ascaris eggs
GB/T 22923-2008 fertilizer automatic analyzer determination of nitrogen, phosphorus and potassium
GB/T 23349 fertilizer of arsenic, cadmium, lead, chromium, mercury ecological indicators
Determination of GB/T 24890-2010 chlorine ion content in compound fertilizer
Determination of GB/T 24891 Fertilizer Feed Size
HG/T 2843 fertilizer products for chemical analysis commonly used standard titration solution, standard solution, reagent solution and indicator solution
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Fertilizer fertilizer
To provide plant nutrients its main effect materials.
3.2
Inorganic (mineral) fertilizers inorganic (mineral) fertilizer
Was marked nutrient salts in the form of fertilizers, by the extraction, physical and (or) method of the chemical industry is made.
3.3
Organic fertilizer organicfertilizer
Mainly from plants and (or) animals, applied to the soil to provide plant nutrition for the main effect of the carbon material.
3.4
Compound fertilizer compoundfertilizer
Nitrogen, phosphorus and potassium variations in nutrient, at least by the chemical fertilizer and (or) method of blending made two of the indicated amount of nutrients.
3.5
It contains a certain amount of organic fertilizer compound fertilizer.
3.6
Total nutrient totalprimarynutrient
Total nitrogen, total phosphorus pentoxide, and potassium hydroxide of effective and to mass fraction.
4 Requirements
4.1 Appearance. granular or strip products, without mechanical impurities.
4.2 Organic - inorganic compound fertilizers shall comply with the requirements of Table 1, and shall comply with the indicated values.
Table 1 Organic - inorganic compound fertilizer requirements
project
index
Type Ⅰ Type Ⅱ
Total nutrients (N P2O5 K2O) mass fraction of a /% ≥ 15.0 25.0
Water (H2O) mass fraction b /% ≤ 12.0 12.0
Organic matter content /% ≥ 20 15
Size (1.00mm ~ 4.75mm or 3.35mm ~ 5.60mm) c /% ≥ 70
PH (pH) 5.5 ~ 8.0
Ascaris eggs mortality rate /% ≥ 95
Fecal coliform/(a / g) ≤ 100
The chloride ion content d /% ≤ 3.0
Its mass fraction of arsenic compounds (as As) /% ≤ 0.0050
Cadmium and its compounds content (in terms Cd) /% ≤ 0.0010
Lead and its compounds content (Pb) /% ≤ 0.0150
Chromium compounds and their mass fraction (in terms Cr) /% ≤ 0.0500
The mass fraction of mercury and its compounds (as Hg) /% ≤ 0.0005
Nutrient content of a single mark of not less than 3.0%, and the measured value and indicated a single nutrient value not greater than the absolute value of the negative deviation of 1.5%.
b Water to factory inspection data.
c noted plant inspection data, when the user granularity with special requirements, may be negotiated OK.
d If the product chlorine ion content greater than 3.0%, and marked "chlorine" in the packaging container, the project may not required.
5 Test methods
Warning --- reagent and potassium dichromate solution with oxidation resistance, and sulfuric acid solution, hydrochloric acid, silver nitrate and sodium hydroxide solution
Corrosive liquid, related operations should be carried out in a fume hood. This standard does not point out all possible security issues, users have a responsibility to
Appropriate safety and health practices and to ensure compliance with the conditions relevant national regulations.
5.1 General provisions
This standard reagent preparation, and water solution used in the method of preparation and specifications are not specified, shall be according to HG/T 2843 regulations.
5.2 Appearance
Visual method.
5.3 Determination of Moisture
Press/T 8576 provisions of GB/T 8577 GB carried out or to GB/T 8577 method of arbitration law. For containing ammonium bicarbonate and
Fertilizers other volatile substances in the drying process will produce a non-water should be used in GB/T 8577 Method of determination.
5.4 Determination of total nitrogen
Press 17767.1 or GB/T 22923-2008 3.1 requirements in GB/T were to GB/T 17767.1 method is secondary
Cut method.
5.5 Determination of effective phosphorus pentoxide content
Performed according to GB/T 8573 stipulated.
5.6 Determination of the total content of potassium
According to GB/T 17767.3 of the regulations.
5.7 Determination of organic matter content of potassium dichromate volumetric method
5.7.1 Principle
With an amount of sulfuric acid and potassium dichromate solution, under heating conditions, the organic - inorganic compound fertilizer organic carbon oxidation, the remaining weight
Potassium chromate standard solution titration solution titrated with ferrous sulfate (ferrous sulfate or ammonium), while for the blank test. According to extinction around oxidizing agent
Consumption, calculate the content of organic carbon, organic carbon content multiplied by 1.724 empirical constants turn count as organic matter.
5.7.2 Reagents and materials
5.7.2.1 sulfuric acid.
5.7.2.2 sulfuric acid solution. 11.
5.7.2.3 potassium dichromate solution. c (16K2Cr2O7
) = 0.8mol/L. Weigh 39.23g potassium dichromate was dissolved in 600mL ~ 800mL
Dilution water, add water to 1L, stored in a reagent bottle aside.
5.7.2.4 Potassium dichromate standard solution. c (16K2Cr2O7
) = 0.2500mol/L. Learn from 120 ℃ drying 4h said reference dichromate
Potassium 12.2577g, with a small amount of water to dissolve, then transferred into a 1L volumetric flask, dilute to the mark and mix.
5.7.2.5 1,10- phenanthroline - ammonium ferrous sulfate mixed indicator solution.
5.7.2.6 aluminum. CP.
5.7.2.7 ferrous sulfate (ferrous sulfate or ammonium) standard titration solution. c (Fe2) = 0.25mol/L. Weigh ferrous sulfate (FeSO4 ·
7H2O) 70g {or ferrous ammonium sulfate [(NH4) 2SO4 · FeSO4 · 6H2O] 100g}, was dissolved in 900mL of water, was added sulfuric acid 20mL,
Diluted with water to 1L (filtered if necessary), after shaking stored in brown bottles. This solution is susceptible to air oxidation, so the application each time you use the weight
Potassium chromate standard solution calibration. Added two clean aluminum in solution, the concentration of the solution can be maintained long-term stability.
Ferrous sulfate (ferrous sulfate or ammonium) calibration standard titration solution. Imbibe 25.0mL in 250mL of potassium dichromate standard solution
Erlenmeyer flask, add 50mL ~ 60mL water, 10mL sulfuric acid solution and 1,10-phenanthroline - ammonium ferrous sulfate mixed indicator solution 3-5 drops of sulfur
Ferrous sulfate (ferrous sulfate or ammonium) standard titration titration solution was titrated by the solution turned bright orange green, brick red and finally to the end point. root
According ferrous sulfate (ferrous sulfate or ammonium) consumption standard titration solution, calculate the exact concentration c2, according to equation (1).
c2 = c1 × V1V2
(1)
Where.
Numerical c1 --- reference concentration of potassium dichromate, expressed in moles per liter (mol/L);
V1 --- draw numerical benchmark potassium dichromate solution volume in milliliters (mL);
V2 --- titration consumption of ferrous sulfate (ferrous sulfate or ammonium) numerical standard titration solution volume in milliliters (mL).
5.7.3 Instruments
5.7.3.1 commonly used laboratory instruments.
5.7.3.2 water bath.
5.7.4 Analysis of step
Do two parallel determination of sample.
A sample was weighed 0.1g ~ 1.0g (accurate to 0.0001g) (containing carbon is not more than 15mg), into the 250mL flask, accurately
Added 15.0mL 15mL sulfuric acid and potassium dichromate solution, and added to the small funnel neck curved triangular bottle, then placed in already boiling 100 ℃
Boiling water bath and incubated for 30min (to maintain boiling water), removing, after cooling, the flask rinsed with water, the bottle should be controlled in the total volume of solution
75mL ~ 100mL, add 3-5 drops of 1,10-phenanthroline - ammonium ferrous sulfate mixed indicator solution, ferrous sulfate (ferrous sulfate or ammonium) standard drops
Fixed titration solution was titrated by the solution turned bright orange green, brick red and finally into the titration end point. At the same time in the previous step Blank
test.
If the sample used for titration of ferrous sulfate (ferrous sulfate or ammonium) is less than the amount of standard titration solution used in the blank test ferrous sulfate (or
1/3 ferrous ammonium sulfate) standard titration solution dosage, the sample weight should be reduced, re-determination.
About chloride ion interference, according to the determination of chloride ion content of 5.12 w1 (%), then be deducted from the measurement results of the organic carbon.
5.7.5 Analysis of the results presentation
W2 organic matter content of the mass fraction, expressed in%, according to equation (2).
w2 = [
(V3-V4) × c2 × 0.003 × 1.5
m0 ×
100-w1/12] × 1.724 (2)
Where.
V3 --- blank test, consumption of ferrous sulfate (ferrous sulfate or ammonium) numerical standard titration solution volume, in units of milli
L (mL of);
V4 --- the determination of the sample, consumed ferrous sulfate (ferrous sulfate or ammonium) numerical standard titration solution volume, in units of milli
L (mL of);
c2 --- ferrous sulfate (ferrous sulfate or ammonium) numerical standard titration solution concentration, expressed in moles per liter (mol/L);
--- 0.003 molar mass values of the fourth carbon units of grams per millimole of (g/mmol);
1.5 --- oxidation correction factor;
w1 --- chloride ion content of the sample (mass fraction),%;
1/12 --- and 1% by mass of chloride ions considerable fraction of organic carbon;
1.724 --- experience conversion factor between organic carbon and organic matter;
Numerical m0 --- sample mass, in grams (g).
The results represent the arithmetic mean to one decimal place, take the parallel determination results of the measurement results.
5.7.6 allowable difference
Parallel determination results is not more than 1.0% absolute difference;
The absolute difference between the measurement results from different laboratories is not more than 1.5%.
5.8 Determination of particle size sieving
Performed according to GB/T 24891 stipulated.
5.9 Determination of pH pH pH meter method
5.9.1 Principle
The sample was dissolved in water, with a pH meter measuring acidity.
5.9.2 Reagents and solutions
5.9.2.1 phthalate standard buffer solution. c (C6H4CO2HCO2K) = 0.05mol/L.
5.9.2.2 standard phosphate buffer solution. c (KH2PO4) = 0.025mol/L, c (Na2HPO4) = 0.025mol/L.
5.9.2.3 standard borate buffer solution. c (Na2B4O7) = 0.01mol/L.
5.9.3 Instruments
5.9.3.1 usual laboratory instruments.
5.9.3.2 pH pH meter. sensitivity 0.01pH units.
5.9.4 Analysis of step
Do two parallel determination of sample.
Weigh the sample 10.00g in 100mL beaker, add 50mL of carbon dioxide-free water, stir 1min, standing 5min, with pH
Acidimeter. Measured before using standard buffer solution of pH meter for verification.
5.9.5 Analysis of the results presentation
PH of the sample expressed as pH.
Take the arithmetic mean of the parallel determination results of the measurement results.
5.9.6 allowable difference
Parallel determination results is not more than the absolute difference 0.10pH.
Determination of 5.10 Ascaris eggs mortality
Conducted in accordance with GB/T 19524.2 of.
Determination of the number of fecal coliform 5.11
Performed according to GB/T 19524.1 requirements.
5.12 Determination of chloride ion content
5.12.1 Principle
Sample in acidic solution (filtrate color if the sample solution after extraction with boiling water filtration, mixing the sample and reagent mixing Ai Sika
Together, to remove by burning fuel and chlorine into chloride), an excess of silver nitrate solution; the chlorine ion converted into silver chloride Shen
Lakes, parcels with dibutyl phthalate precipitate with ammonium ferric sulfate as an indicator, the remaining silver titration with ammonium thiocyanate standard titration solution of nitric acid.
5.12.2 Reagents and solutions
5.12.2.1 with GB/T 24890-2010 reagents and materials.
5.12.2.2 silver nitrate solution. 10g/L.
5.12.2.3 activated carbon.
5.12.2.4 Ai Sika mixed reagent. anhydrous sodium carbonate and magnesium oxide in a mass ratio of 2.1 mixed and finely ground to less than 0.25mm
Mix well.
5.12.3 Instruments
5.12.3.1 usual laboratory instruments.
5.12.3.2 box-type resistance furnace; temperature can be controlled at (500 ± 20) ℃.
5.12.4 analysis step
Do two parallel determination of sample.
Performed according to GB/T 24890-2010 specified.
If the filtrate color, should imbibe a quantity of filtrate (chlorine ion about 25mg) plus 2g ~ 3g of activated carbon, stir over
Filtered and washed three to five times, each time with water to about 5mL, collect all filtrate was 250mL Erlenmeyer flask, the following according to GB/T 24890-2010 of
Analysis step, "added 5mL solution of nitric acid, silver nitrate solution was added 25.0mL" were determined.
The activated carbon can not be discolored samples, sample weight can be reduced, Weigh 1g ~ 2g sample, the sample is filled into the 2g ~ 4g (weighing accuracy
0.1g) Ai Sika mixed reagent porcelain crucible, carefully mix, then cover 2g Ai Sika reagent mixing, into the porcelain crucible
(500 ± 20) ℃ box resistance furnace burning 2h. The porcelain crucible is removed from the furnace was cooled to room temperature, which was burning into 250mL
Beaker and rinsed with 50mL ~ 60mL hot crucible together with the inner wall of the washing liquid into the beaker. Qualitative filter paper by decantation,
The residue was washed with hot water 1 to 2 times, and then the residue was transferred to a funnel, and then the hot water filter and carefully wash the residue washed until no chlorine ions
(With 10g/L solution of silver nitrate test), all the filtrate are collected 250mL volumetric flask, dilute to the mark and shaken. Imbibe a certain amount
The filtrate (containing chlorine ions about 25mg) in 250mL conical flask, the following according to GB/T 24890-2010 of the analysis step, "added 5mL
Nitric acid solution, silver nitrate solution was added 25.0mL "was measured.
5.12.5 expression analysis
See GB/T 24890-2010 of the analysis and calculation of results.
5.12.6 allowable difference
See GB/T 24890-2010 specified.
5.13 arsenic, cadmium, lead, chromium and mercury determination
Performed according to GB/T 23349 stipulated.
6 Inspection rules
6.1 test categories and test items
Including product testing and factory inspection type of inspection, Ascaris eggs Table 1 Mortality, fecal coliform, chloride, arsenic, cadmium, lead, chromium, mercury
Determination of the type test project, the rest of the factory inspection items. Type test items in the following cases shall be determined.
a) the production, raw materials, technology and equipment changes occur official;
B) When the official production, after regular or accumulated to a certain amount, a test should be carried out periodically;
c) the national quality supervision bodies type inspection requirements.
6.2 Batch
Product batches tested to yield one or two days a group, the largest quantities of 500t.
6.3 Sampling Scheme
6.3.1 bagged product
Not more than 512 bags, according to Table 2 to determine the minimum number of sampling bags; bags of greater than 512, according to equation (3) results to determine the minimum number of sampling bags,
In case of decimals, is entered as an integer.
n = 3 ×
3N (3)
Where.
n --- minimum number of sampling bags;
N --- each batch of the total number of bags.
Table 2 to determine the number of sampling bags
The total number of bags Minimum sampling bags
All 1 ~ 10
11 to 49 11
50 ~ 6412
65 ~ 8113
82 ~ 10114
102 to 12515
126 to 15116
152 ~ 18117
The total number of bags Minimum sampling bags
182 ~ 21618
217 - 25419
255 to 29620
297 ~ 34321
344 ~ 39422
395 ~ 45023
451 ~ 51224
Table 2 or (3) the results randomly selected a certain number of bags, each bag longest diagonal is inserted into the bag along with a sampler 3/4 removed
Less than 100g samples of each batch of samples taken total amount of not less than 2kg.
6.3.2 bulk products
Performed according to GB/T 6679 regulations.
Reduction of sub-samples 6.4
Samples will be taken rapidly mixing with a riffle or quartering the sample was reduced to less than 1kg, and then shrink into two, packed in two
Clean, dry grinding mouth stuffed with a 500mL glass jar or plastic bottle, sealed and labeled, indicating the manufacturer name, product name
Said the product categories, production date or batch number, date of sampling and sample names. Bottle of product quality analysis done, save another bottle for two months, in order to
Future reference purposes.
6.5 Sample Preparation
From 6.4 fetch a bottle of samples taken after several minutes reduced to about 100g (remaining unground samples for particle size measurement) quickly ground to
All test sieve through 1.00mm aperture (such as wet or difficult samples crushed, ground to be all through the test sieve aperture 2.00mm), mixed
Uniform, collected and dried bottle for component analysis. The remaining samples for particle size, mortality Ascaris eggs, fecal coliform determination.
6.6 Result judgment
6.6.1 The standard of product quality indicators pass judgment, adopted GB/T 8170-2008 in the "rounding value comparison method."
Inspection results 6.6.2 test items all satisfy the requirements of this standard, this batch of qualified products.
6.6.3 When factory inspection, if there is an indicator of the test results do not meet the requirements of this standard should be re by 2 times the amount of recoverable bag
Take samples to test and re-test results, even if there is an index does not meet the requirements of this standard, this batch of product failure.
6.6.4 inspection of each batch of manufactured products should be accompanied by a certificate of quality, which includes. the production company name, address, product name, product
Category, batch number or production date, net content, total nutrients, with the type, organic matter content, chloride ion content, pH value and the number of this Standard.
7 Logo
7.1 should be marked on the front of the product packaging container product categories (such as type Ⅰ, Ⅱ), with type, organic matter content.
7.2 product contains nitrate, should be indicated on the face "containing nitrate" in the packaging container.
7.3 Nominal potassium (type), potassium nitrate (type), sulfur and other easily lead users into thinking it does not contain chlorine products should not also be marked "chlorine."
Application of chlorine products clearly marked on the front kanji "chlorine", instead of "chlorine", "containing Cl" or "Cl" and so on. Labeled "chlorine" in the product package
There should be mounted on the container bogey chlorine crops pictures.
7.4 product packaging bags should have instructions for use, including. warnings (such as "high chlorine content, improper use will damage crops."
Etc.), the use of suitable crops and crop unfit recommended amount and the like.
7.5 net weight shall be marked with a single value, such as 50kg.
7.6 should be consistent with the rest of GB 18382.
8 packaging, transportation and storage
8.1 product plastic bag lined with polyethylene film bags PP woven bag or film, in compliance with the conditions specified in GB 8569
Under appropriate use of economic and practical packaging. Product net weight (50 ± 0.5) kg, (40 ± 0.4) kg, (25 ± 0.25) kg, (10 ± 0.1) kg,
The average net weight, respectively, not less than 50.0kg, 40.0kg, 25.0kg, 10.0kg. When the user of net weight with special requirements
When, by the supply and demand sides negotiated settlement to the provisions of both the contract shall prevail.
Is within the range indicated net weight products have additives 8.2, should be mixed with the raw materials can not be placed in small packaging
Bag.
8.3 The product should be stored in a cool dry place, in the course of transportation should be rain, moisture, sun protection, anti-rupture.
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