HG/T 5049-2016 PDF English
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HG/T 5049-2016: Urea containing alginic acid---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/HGT5049-2016
ICS 65.080
G21
Record No.: 56414-2016
Chemical Industry Standard of the People’s
Republic of China
HG/T 5049-2016
Urea containing alginic acid
Issue date: 2016-10-22 Implementation date: 2017-04-01
Issued by Ministry of Industry and Information Technology of the People’s
Republic of China
HG
HG/T 5049-2016
Foreword
This standard is drafted in accordance with the rules given in the GB/T 1.1 Directives for
standardization — Part 1: Structure and drafting of standards.
This standard was proposed by China Petroleum and Chemical Industry Federation.
This standard was prepared by SAC/TC 105/SC 5 of National Technical Committee 105 on Fertilizers
and Soil Conditioners of Standardization Administration of China.
This standard was drafted by: Shanghai Research Institute of Chemical Industry, Institute of
Agricultural Resources and Regional Planning of Chinese Academy of Agricultural Sciences,
China BlueChemical Ltd, Sichuan Meifeng Chemical Industry Co., Ltd, Ruixing Group Co. Ltd,
Qingdao Hailiyuan Biological Technology Co. Ltd and Qinhuangdao Wuxian Weiai Technology
Development Co., Ltd.
Main drafters: Zhao Bingqiang, Duan Lulu, Yuan Liang, Meng Guangyin, Tao Jiaming, Yao Ye, Shen
Bing, Li Wei, Zhang Shoufu, Tian Yaoxiong, Zhao Shuguang and Ji Min.
HG/T 5049-2016
Urea containing alginic acid
1 Scope
This standard specifies the terms and definitions, requirements, test methods, inspection
rules, marks and packaging, transport and storage of the urea containing alginic acid.
This standard is applicable to urea containing alginic acid prepared by adding alginic acid
synergistic liquid extracted from seaweed as the main raw material during the urea production
process, and then granulating by using a urea granulation technology.
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 2440 Urea
GB/T 2441.1 Determination of urea-Part 1: Total nitrogen content
GB/T 2441.2 Determination of urea-Part 2: Biuret content-Spectrophotometric method
GB/T 2441.3 Determination of urea-Part 3: Water content-Karl Fischer method
GB/T 2441.7 Determination of urea-Part 7: Particle size-Sieve method
GB/T 2441.9 Determination of urea-Part 9: Methylenediurea content-Spectrophotometric method
GB/T 6679 General rules for sampling of solid chemical products
GB/T 6682 Water for Analytical Laboratory Use- Specifications and test methods
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting
values
GB/T 8569 Packaging of solid chemical fertilizers
GB 18382 Fertilizer Marking-Presentation and declaration
HG/T 2843 Chemical Fertilizer Products-Standard volumetric, standard, reagent and indicator
solutions for chemical analysis
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
alginic Acid
Pipette 10.00 mL of the sodium alginate stock solution into a 100 mL volumetric flask, and
dilute to a constant volume with water.
5.3.2.6 A carbazole ethanol solution: 2 g/L.
Weigh 0.20 g of carbazole, dissolve with the anhydrous ethanol and dilute to a constant volume
of 100 mL.
5.3.3 Instrument
Spectrophotometer: an absorption cell with an optical path of 1 cm and conduct a measurement
at 520 nm.
5.3.4 Test Procedure
5.3.4.1 Plotting of standard curve of alginic acid
Pipette 0.00 mL, 0.20 mL, 0.40 mL, 0.60 mL, 0.80 mL, 1.00 mL and 1.20 mL of the sodium alginate
standard solution to 50 mL colorimetric tubes, respectively, add 3.00 mL, 2.80 mL, 2.60 mL,
2.40 mL, 2.20 mL, 2.00 mL and 1.80 mL of water to make the volume 3.00 mL. Then transfer the
colorimetric tubes containing the solutions to an ice-water bath, slowly add 10.00 mL of the
sulfuric acid while shaking, starting with one drop per second, increasing to two drops per
second after half of the addition, and heating in a boiling water bath for 20 minutes after
the addition. Take the colorimetric tubes containing the solutions out and cool to 80℃, then
add 0.30 mL carbazole ethanol solution, shake well and place at room temperature for 45 min.
Use a 1 cm absorption cell for colorimetry at a wavelength of 520 nm, use a reagent blank is
used as a reference, measure an absorbance, use mass (mg) of sodium alginate contained in a
standard colorimetric solution of a total color development volume as an x-coordinate, use
the measured absorbance as a y-coordinate, and plot a standard curve or solve a linear
regression equation.
5.3.4.2 Determination of Alginic Acid Content
Weigh 15-20 g (accurate to 0.0002 g) of a sample, add 25 mL of water to dissolve, transfer
the dissolved sample to a 50 mL volumetric flask, dilute it to a constant volume, and shake
it to even. Accurately pipette 3.00 mL of a sample solution into a 50 mL colorimetric tube.
The following steps are the same as the plotting of the standard curve. At the same time, urea
is used as a control.
5.3.5 Expression of Test Results
5.3.5.1 Determination of Alginic Acid Content
Consult the mass of the alginic acid from the corresponding absorbance from the standard curve
or calculate the mass of the alginic acid from the regression equation.
Use formula (1) to calculate the content of the alginic acid X in the sample or control urea
in a mass fraction whose value is expressed in %:
5.3.5.2 Alginic Acid Content in Products
Use formula (2) to calculate the content of the alginic acid H in the products in a mass fraction
whose value is expressed in %:
The calculation results are expressed to three decimal places and an arithmetic average of
the parallel determination results is used as the determination results.
5.3.5.3 Allowable Tolerance
The relative difference of the parallel determination results is less than or equal to 10%;
5.4 Ammonia volatilization inhibition rate
5.4.1 Principle
Urea containing alginic acid is hydrolyzed into ammonium nitrogen under the action of urease.
In the presence of magnesium oxide, the ammonium nitrogen produced by a hydrolysis of amide
nitrogen in the urea containing alginic acid will be converted into ammonia to release out,
a boric acid solution absorbs the released ammonia, then a certain concentration of a sulfuric
acid solution is used to titrate the released ammonia, urea is used as a control, and the ammonia
volatilization inhibition rate is calculated on a basis of a volume of the consumed sulfuric
acid standard solution.
5.4.2 Reagents and Materials
HG/T 5049-2016
5.4.2.1 Magnesium Oxide.
5.4.2.2 Urea.
5.4.2.3 A sulfuric acid standard volumetric solution: = 0.01 mol/L.
5.4.2.4 A urease solution.
Weigh 0.100 g of urease (activity about 1 U/mg), add 0.5 mL of water, grind the urease with
a mortar to a paste, transfer all the ground urease to a 250 mL volumetric flask, shake the
urease solution well, and store the urease solution in a refrigerator at 4℃ for a standby
application.
5.4.2.5 A boric acid solution: 2%.℃
5.4.2.6 An alkaline glue solution.
Add 40 g arabic gum and 50 mL water into a beaker, heat to 70℃～80℃, stir to dissolve, after
cooling to room temperature, add 20 mL glycerin and 20 mL saturated potassium carbonate aqueous
solution and stir the materials well; centrifuge to remove foam and insoluble matters and store
clear liquid in a glass bottle for a standby application.
5.4.2.7 A mixed indicator.
Dissolve 0.099 g of bromocresol green and 0.066 g of methyl red in 100 mL of ethanol (95%).
5.4.3 Instruments
5.4.3.1 Common laboratory devices.
5.4.3.2 Conway dish.
5.4.3.3 Incubator.
5.4.4 Test Procedure
5.4.4.1 Incubation
Weigh 1.000 g of the sample in an outer chamber of the Conway dish, add 10 mL of water, shake
the Conway dish horizontally to make the sample evenly dissolved, then weigh 0.10 g of magnesium
oxide, add the magnesium oxide to the outer chamber, and shake a mixture carefully to disperse
the magnesium oxide in the sample solution. Pipette 2 mL of the boric acid solution in an inner
chamber, add 3 drops of the mixed indicator, then apply a proper amount of the alkaline glue
solution to an edge of the outer chamber, cover the Conway dish with ground glass, and rotate
several times to enable an edge of the dish and the ground glass to adhere completely. Move
the ground glass, add 5 mL of the urease solution to the outer chamber through an edge of a
gap, immediately cover the dish tightly, shake the Conway dish horizontally to enable the urease
solution to be evenly dispersed, and then place the Conway dish in a 37℃±2℃ incubator for
90 min.
5.4.4.2 Titration
After the incubation, take out the Conway dish and remove the ground glass. Titrate ammonia
absorbed by the boric acid solution in the inner chamber with the sulfuric acid standard
volumetric solution. The color of solution changing from green to reddish is regarded as an
end point of the titration. The volume of the consumed sulfuric acid standard volumetric
solution is recorded as V3. The urea is used as a control and the volume of the consumed sulfuric
acid standard volumetric solution is recorded as V4.
5.4.5 Expression of Test Results
5.4.5.1 Ammonia volatilization inhibition rate
Use formula (3) to calculate the ammonia volatilization inhibition rate f, whose value is
expressed in %:
The calculation results are expressed to one decimal place and an arithmetic average of the
parallel determination results is used as the determination results.
5.4.5.2 Allowable Tolerance
The relative difference of the parallel determination results is less than or equal to 30%;
5.5 Biuret content
In accordance with GB/T 2441.2.
5.6 Water content
In accordance with GB/T 2441.3.
5.7 Methylenediurea content
In accordance with GB/T 2441.9.
5.8 Particle size
In accordance with GB/T 2441.7.
6 Inspection Rules
6.1 Inspection Categorization and Inspection Items
Product inspection includes ex-factory inspection and type inspection. Ex-factory inspection
items include total nitrogen, alginic acid content, biuret, water content and particle size.
Type inspection items, including all the items in Chapter 4.
HG/T 5049-2016
n——minimum number of sampling bags
N——total number of bags per batch.
According to the calculation results of Table 2 or formula (4), randomly select the number
of sampling bags, insert a sampler from the longest diagonal of each bag to a 3/4 position
of the bag to take more than or equal to 100 g of a sample and the sample amount for each batch
shall be more than or equal to 2 kg.
6.3.2 Bulk products
Sampling in accordance with GB/T 6679.
6.4 Sample Splitting
Split the collected sample quickly to 600 g～1,200 g with a splitting device or a quartering
method, sub-package the split sample into two clean and dry wild-mouth bottles with ground
glass stoppers or polyethylene bottles, stick labels and mark the name of a manufacturer,
product name, batch number, particle size range, sampling date and the name of a sample taker.
One bottle is used for product quality analysis and the other one is stored for two months
for future inspection.
6.5 Result Determination
6.5.1 Whether the items of the product are qualified is determined by the "rounding value
comparison method" of GB/T 8170.
6.5.2 When all inspection results of the inspection items meet the requirements of this
standard, the batch of products is deemed to be qualified.
6.5.3 During the ex-factory inspection, if one of the indicators in the inspection results
does not meet the requirements of this standard, retake twice the samples from packaging bags
for inspection, and in re-inspection results, even if one indicator does not meet the
requirements of this standard, the entire product batch is deemed to be unqualified.
6.5.4 Each batch of the conforming factory products shall be accompanied by a quality
certificate whose content includes: the name of the manufacturer, address, product name, batch
number or production date, product net content, total nitrogen content, alginic acid content,
ammonia volatilization inhibition rate, biuret content, the standard NO. and the content that
must be marked by laws and regulations.
7 Mark
The product packaging bag shall be marked with total nitrogen content, alginic acid content,
ammonia volatilization inhibition rate, the standard NO. and GB/T 2440, and the rest shall
be in accordance with regulations of Label in GB 18382 and GB/T 2440.
8 Packaging, Transport and Storage
8.1 The product packaging shall be performed according to the materials specified in GB 8569,
packaging specifications are 50.0 kg, 40.0 kg, 25.0 kg and 10.0 kg, a permissible range of
the net content of each bag is 50 kg±0.5 kg, 40 kg±0.4 kg, 25 kg±0.25 kg and 10 kg±0.1
kg, and the average net content of each bag shall be more than or equal to 50.0 kg, 40.0 kg,
25.0 kg and 10.0 kg. The packaging specifications given in the contract between the supplier
and the buyer can also be used.
8.2 When there are additives in the products within the net content range of each bag, they
shall be mixed evenly with the original materials and shall not be placed in the packaging
bags in a form of small packages.
8.3 Transport and loading and unloading tools of the products shall be clean, flat and free
of protruding sharp objects to avoid piercing or scratching the packages.
8.4 The products shall be stored in a flat, shaded, cool, ventilated and dry warehouse. The
packages shall be stacked neatly and a stacking height shall be less than 7 m. During the
transportation and storage processes, the packages shall be protected from moisture, sun and
rupture.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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