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SN/T 1037-2020 English PDF

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SN/T 1037-2020: (Import and export lime nitrogen inspection method)
Status: Valid

SN/T 1037: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
SN/T 1037-2020English179 Add to Cart 3 days [Need to translate] (Import and export lime nitrogen inspection method) Valid SN/T 1037-2020
SN/T 1037-2002English279 Add to Cart 3 days [Need to translate] Method for the determination of lime nitrogen for import and export Obsolete SN/T 1037-2002

PDF similar to SN/T 1037-2020


Standard similar to SN/T 1037-2020

GB/T 4472   GB/T 3143   SN/T 1039   SN/T 4239   

Basic data

Standard ID SN/T 1037-2020 (SN/T1037-2020)
Description (Translated English) (Import and export lime nitrogen inspection method)
Sector / Industry Commodity Inspection Standard (Recommended)
Classification of Chinese Standard G00;G09
Classification of International Standard 71.040.40
Word Count Estimation 8,812
Date of Issue 2020-08-27
Date of Implementation 2021-03-01
Older Standard (superseded by this standard) SN/T 1037-2002
Regulation (derived from) General Administration of Customs Announcement No. 98 [2020]
Issuing agency(ies) General Administration of Customs

SN/T 1037-2020: (Import and export lime nitrogen inspection method)

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Method for the inspection of Lime nitrogen for import and export The People's Republic of China Entry-Exit Inspection and Quarantine Industry Standards Replace SN/T 1037-2002 Import and export lime nitrogen inspection method 2020-08-27 release 2021-03-01 implementation Issued by the General Administration of Customs of the People's Republic of China

Foreword

This standard was drafted in accordance with the regulations given in GB/T 1.1-2009. This standard replaces SN/T 1037-2002 "Import and Export Lime Nitrogen Inspection Method". Compared with SN/T 1037-2002, the main technical changes of this standard are as follows. --In the determination of 4 total nitrogen content, "4.2 Method 2.Combustion Analysis Method (Method 2)" was added to define the original method It is "4.1 Method One. Distillation Titration Method (Arbitration Method)". This standard was proposed and managed by the General Administration of Customs of the People's Republic of China. Drafting organizations of this standard. Yinchuan Customs of the People's Republic of China and Shanghai Customs of the People's Republic of China. The main drafters of this standard. Sun Pubing, Zhang Kun, Zhu Zhu, Liu Wenli, Chen Lin, Wang Changjian. The previous editions of the standard replaced by this standard are as follows. - SN/T 1037-2002. Import and export lime nitrogen inspection method

1 Scope

This standard stipulates the sample preparation and general regulations of import and export lime nitrogen, the determination of total nitrogen content, the determination of free calcium carbide, and the sieve The method of measuring the remainder. This standard applies to the determination of lime nitrogen for import and export. Warning. According to the provisions of Chapter 6 of GB 12268-2012, this product belongs to category 4, item 4.3, which emits flammable gas in contact with water Be cautious when operating. The sample and some reagents used in this test method are toxic and corrosive, and the operator must be in a fume hood Handle with care! If it splashes on the skin, it should be rinsed immediately. In severe cases, it should be treated immediately. When using flammable products, it is strictly forbidden to use an open flame for heating.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this standard. GB/T 601 Preparation of Standard Titration Solution for Chemical Reagents GB/T 602 Preparation of standard solutions for impurity determination of chemical reagents GB/T 6679 General Rules for Sampling of Solid Chemical Products GB/T 6682 Analytical laboratory water specifications and test methods GB/T 10665 Calcium carbide (calcium carbide) GK 12268-2012 List of Dangerous Goods SN/T 3097 Determination of Total Nitrogen in Fertilizers by Combustion Analysis Method

3 Sample preparation and general regulations

3.1 Take samples Sampling in accordance with GB 6679, divide the sample stack into equally divided grids, and the grids will be no less than 20 grids when dividing large samples. Less than 12 grids, not less than 4 grids for subdividing samples, reduce to 1 kg, save 250 g of samples, 250 g of analytical samples, and pack them in a dry seal In the bottle, indicate the batch number, production date, manufacturer name, sampler and date. 3.2 General provisions Unless otherwise specified, the reagents used are of analytical grade, and the water is the secondary water specified in GB/T 6682.The test papers are all precision test papers. test The standard titration solution, impurity standard solution, reagents and products required in the test, unless other requirements are specified, shall be in accordance with GB/T 601, Prepared according to GB/T 602.

4 Determination of total nitrogen content

4.1 Method 1.Distillation Titration Method (Arbitration Method) 4.1.1 Method summary Under the action of the catalyst, the nitrogen in the sample is completely oxidized, decomposed and turned into amine salt in concentrated sulfuric acid, which is absorbed by sulfuric acid standard solution. Back titration with alkali standard solution to determine total nitrogen. 4.1.2 Reagents and materials 4.1.2.1 Sulfuric acid (ρ=1.84 g/mL). 4.1.2.2 Sodium hydroxide solution. 40%. 4.1.2.3 Sulfuric acid standard solution. 0.1 mol/L. 4.1.2.4 Sodium hydroxide standard solution. 0.1 mol/L, see GB/T 601 for the preparation method. 4.1.2.5 Catalyst. Weigh 100 g k2SO4, 10 g CuS04 · 5 H20, 1 g selenium powder, and grind it to 80 mesh (0.175 mm) in a mortar, Contained in a dry ground bottle. 4 1.2.6 Indicator. 0.1% methyl red ethanol solution 0.5% cresol green ethanol solution (11). 4.1.3 Apparatus and equipment 4.1.3.1 Semi-automatic protein analyzer (or equivalent equipment). 4.1.3.2 Electric heating digester. 4.1.3.3 Magnetic stirrer and electromagnetic stirrer. 4.1.3.4 Acid burette. 4.1.4 Measurement procedure 4.1.4.1 Digestion Weigh 0.1 g sample (accurate to 0.0001 g), put it into the cleaned and dried digestion tube without damage, and add a few grains with a diameter of 3 mm~ 4 mm glass beads, 6 g catalyst (4.1.2.5) and 10 mL sulfuric acid (4.1.2.1), heat digestion for 30 min (extendable 5 min~10 min). Then cool to room temperature, add 50 mL of water to the digestion tube and mix well. 4.1.4.2 Distillation Accurately add 25 mL of sulfuric acid standard solution (4.1.2.3) and 2~3 drops of indicator (4.1.2.6) into a 250 mL Erlenmeyer flask. The bottle is placed on the receiving tube of the distillation apparatus, and the nozzle is immersed in the solution. Add 50 mL of sodium hydroxide solution (4.1.2.2) to the digestion tube, After 7 minutes of distillation, close the steam valve and remove the receiving flask. 4.1.4.3 Determination Titrate the solution in the receiving bottle with sodium hydroxide standard solution (4.1.2.4), and drop it until the solution turns from purple-red to bright green as the end point. 4.1.4.4 Blank test Except that no sample is added, all are carried out in accordance with the above-mentioned measurement steps (4.1.4.3). 4.1.5 Calculation and expression of results The total nitrogen content in the sample is calculated by mass fraction and calculated according to formula (1). 4.1.6 Precision The precision is shown in Table 1.

5 Determination of free calcium carbide

5.1 Method summary The sample is completely decomposed in a closed container, and the content of free calcium carbide is obtained from the volume change before and after the reaction. 5.2 Materials and reagents 5.2.1 Saturated salt water. saturated salt water saturated with acetylene. 5.2.2 Graduated cylindrical funnel. 60 mL. 5.2.3 Reaction flask. 100 mL. 5.2.4 Level bottle. 250 mL. 5.2.5 Thermometer. 5.3 Test device The test device is shown in Figure 1. 5.4 Measurement procedure Weigh 2.000 g sample (accurate to 0.001 g) into a dry 100 mL reaction flask (5.2.3), and immediately use a thermometer (5.2.5) Tighten the bottle mouth with the stopper of the graduated separatory funnel, rotate the two-way stopcock to communicate with the measuring pipe, and wait for the air in the reaction bottle (5.2.3) to be exhausted After that, turn the two-way stopcock to communicate with the atmosphere, adjust the zero point of the gas pipe, close the piston, and transfer the cylindrical graduated funnel (5.2.2) to the reaction flask. (5.2.3) accurately add 25 mL of saturated brine (5.2.1) saturated with acetylene, shake the reaction flask constantly to make calcium carbide (free electricity) After the acetylene generated by the reaction is stabilized in the measuring pipe, move the level bottle (5.2.4) to balance the internal and external pressures and read The gas volume and atmospheric pressure and the temperature in the reaction flask during the measurement. 5.5 Calculation results and expressions The mass fraction of free calcium carbide in the sample is calculated as x2 and calculated according to formula (2). 5.6 Precision The precision is shown in Table 2.

6 Determination of the residue on the sieve

6.1 Method summary The sample is sieved through a standard sieve, and the mass of the remainder on the sieve is determined according to the mass of the material under the sieve. 6.2 Apparatus and equipment 6.2.1 Standard sieve. 30 mesh (0.595 mm). 6.2.2 Balance. with a sense of 0.01 g. 6.2.3 Brushes. 6.2.4 Oscillator. 60 r/min. 6.3 Measurement procedure Weigh 20.00 g sample (accurate to 0.01 g), put it into a 30-mesh (0.595 mm) standard sieve (6.2.1), and cover the sieve lid. Place it on the shaker (6.2.4) (or shake it manually), shake for 3 min~5 min, and then weigh the remaining on the sieve. 6.4 Calculation and expression of results The standard sieve volume meter in the sample is calculated according to formula (3).

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