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Chemical Industry Standard of the People's Republic of China
HG2029-91
Industrial Aminoacetic Acid
Published on June 26, 1991
Published by the Ministry of Chemical Industry of the People's Republic of China and implemented on January 1, 1992
Chemical Industry Standard of the People's Republic of China
1 Subject Content and Scope of Application
HG2029-91
This standard specifies the technical requirements, test methods, inspection rules, and marking, packaging, transportation and storage requirements for industrial aminoacetic acid. This standard applies to industrial aminoacetic acid obtained by the reaction of monochloroacetic acid and liquid ammonia. Molecular formula NH2CH,COOH
Relative molecular mass 75.07 (according to the international relative atomic mass in 1987) 2 Reference standards
GB1250
GB3049
GB6284
GB8170
3 Technical requirements
Preparation of standard solution for titration analysis (volumetric analysis) Chemical reagents
Preparation of standard solution for determination of impurities in chemical reagents Preparation of preparations and products used in chemical reagent test methods Methods for expressing and determining limit values General method for determination of iron content in chemical products O-phenanthroline spectrophotometry
General method for determination of water content in chemical products Gravimetric method Value rounding rules
3.1 Appearance: white powder.
The quality of industrial aminoacetic acid shall meet the requirements of Table 1. Table 1
Aminoacetic acid content, %
Chloride (as C1) content, %
Iron (Fe) content, %
Heating loss, %
Test method
First-class product
Qualified product
The reagents and water used in this standard, unless otherwise specified, are analytical reagents and distilled water or water of equivalent purity. The standard solutions, preparations and products used in this standard, unless otherwise specified, shall comply with the provisions of GB601, GB602 and GB603.
4.1 Determination of aminoacetic acid content
Use glacial acetic acid as solvent, crystal violet as indicator, and perchloric acid standard solution as titrant. The reaction product is aminoacetic acid perchlorate. 4.1.1 Reagents and solutions
Approved by the Ministry of Chemical Industry of the People's Republic of China on June 26, 1991 and implemented on January 1, 1992
4.1.1.1 Glacial acetic acid;
4.1.1.2 Crystal violet glacial acetic acid solution: 2g/L; HG2029-91
4.1.1.3 Perchloric acid standard titration solution: cHC1O,) = 0.05mol/L. 4.1.2 Determination steps
Weigh about 0.1g of aminoacetic acid sample (accurate to 0.0002g), place it in a dry conical flask, add 30mL of glacial acetic acid (4.1.1.1) to dissolve, add 2 drops of crystal violet indicator (4.1.1.2), and titrate with perchloric acid standard titration solution (4.1.1.3) until the solution changes from purple to blue-green as the end point, and perform a blank test at the same time. 4.1.3 Expression and calculation of results
The percentage of aminoacetic acid (X1) is calculated according to formula (1): X1 = (V/-V) × 0. 075 07 × 100m
-Concentration of perchloric acid standard titration solution (4.1.1.3), mol/L; Where: c
Vi——Volume of perchloric acid standard titration solution consumed by the sample, mL; V.——Volume of perchloric acid standard titration solution consumed by the blank test, mL; m
-Weighed mass of the sample, g;
0.07507——-The mass of aminoacetic acid equivalent to 1.00mL perchloric acid standard titration solution Cc(HC10,)=1.000mol/L], expressed in grams.
The difference between the results of two parallel determinations shall not exceed 0.2%, and the arithmetic mean shall be taken as the determination result. 4.2 Determination of chloride content
4.2.1 Reagents and solutions
4.2.1.1 Potassium chromate aqueous solution: 100g/L, 4.2.1.2 Standard silver nitrate titration solution: c(AgNO:)=0.05mol/L. 4.2.2 Determination steps
Weigh about 1g of sample (accurate to 0.0002g), put it in a 250mL conical flask, add 50mL of water to dissolve the sample, then add 7 drops of potassium chromate indicator (4.2.1.1), and titrate with standard silver nitrate titration solution (4.2.1.2) until a slightly reddish color is reached, which is the end point, and perform a blank test at the same time. 4.2.3 Expression and calculation of results
The percentage content of chloride (in terms of Cl) (X,) is calculated according to formula (2): X2 = c(VI-Vo) X 0. 035 45
Wherein: c
-concentration of standard silver nitrate titration solution (4.2.1.2), mol/L: V1-volume of standard silver nitrate titration solution consumed by the sample, mL; V. —volume of standard silver nitrate titration solution consumed by the blank test, mL; m-mass of the weighed sample, g;
0.03545-mass of chloride ion equivalent to 1.00mL standard silver nitrate titration solution Lc (AgNO:) = 1.000mol/L), expressed in grams.
The difference between the results of two parallel determinations shall not exceed 0.03%, and the arithmetic mean shall be taken as the determination result. 4.3 Determination of iron content
Weigh about 1g of sample (accurate to 0.0002g) in a 100mL beaker, and perform the following operations according to GB3049. The difference between the results of two parallel determinations shall not exceed 0.0005%, and the arithmetic mean shall be taken as the determination result. 4.4 Determination of heating loss
Weigh about 1g of sample (accurate to 0.0002g), and the drying temperature shall be 80±2℃. Others shall be performed according to GB6284. 2
HG2029-91
The difference between the results of two parallel determinations shall not exceed 0.07%, and the arithmetic mean shall be taken as the determination result. 5 Inspection rules
5.1 This product shall be inspected by the quality inspection department of the manufacturer. The manufacturer shall ensure that all products shipped meet the requirements of this standard. Each batch of products shipped shall be accompanied by a quality assurance certificate. The content includes the manufacturer's name, product name, product grade, batch number, production date, proof that the product quality complies with this standard and the number of this standard. 5.2 The user has the right to inspect the quality of the received products in accordance with the inspection rules and test methods specified in this standard within three months (from the date of leaving the factory, valid for three months). 5.3 Sampling method: Take samples from bags or barrels of each batch of products (the same grade of homogeneous products is a batch). The number of sampling bags (or barrels) is sampled according to Table 2, and random sampling. When the total number of bags (or barrels) in each batch is greater than 500, the number of sampling bags (barrels) is calculated and determined by 3×N (N is the total number of bags in each batch of products). If there is a decimal, it is rounded to an integer. Insert the sampler into 3/4 of the bag to take the sample, and the total sampling volume shall not be less than 2kg. Table 2
Total number of bagsbZxz.net
82~101
102~125
126~151
152181
Number of sampling bags
Total number of bags
182~216
217~254
255~296
297343
344~39 4
395~450
451512
Number of sampling bags
5.4 Mix the samples carefully, divide them into four parts, and pack them into two clean and dry ground glass bottles, seal them, label them, and indicate the manufacturer's name, product name, batch number, production date and sampling date. One bottle is for inspection, and the other is a reserved sample, which is kept for three months for future reference.
5.5 The inspection results shall be determined according to the rounded value comparison method in GB1250, and the rounding shall be carried out according to GB8170. 5.6 If one of the inspection results does not meet the requirements of this standard, samples shall be taken from twice the amount of packaging for verification. If only one item of the re-verification result of the product does not meet the requirements of this standard, the entire batch of products shall be unqualified. 5.7 When the supply and demand parties have disputes over product quality and need arbitration, the arbitration institution shall be selected by both parties through consultation. During arbitration, arbitration inspection shall be carried out in accordance with the inspection method specified in this standard.
6 Marking, packaging, transportation and storage
6.1 The packaging bag or barrel shall be clearly marked with: manufacturer name, product name, grade, batch number, registered trademark, net weight, production date and this standard number.
6.2 This product is packaged in plastic woven bags lined with plastic film or paper barrels lined with plastic film. The net weight of each bag (or barrel) is 25kg. The average net weight of each bag (or barrel) of each batch of products is greater than or equal to 25kg. 6.3 This product should be stored in a cool and dry place. During transportation, it should be protected from rain and sunlight. The packaging bag should not be damaged. 3
Additional instructions:
HG2029-91
This standard was proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Beijing Chemical Research Institute of the Ministry of Chemical Industry. This standard was drafted by Shijiazhuang Donghua Chemical Plant. The main drafters of this standard are Qin Fengqi, Song Xulai and Zuo Gengwen.
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