This standard specifies the technical requirements, test methods, inspection rules, packaging and marking of chemical reagent sodium metabisulfite. This standard applies to the inspection of chemical reagent sodium metabisulfite. GB/T 15900-1995 Chemical reagent sodium metabisulfite (sodium pyrosulfite) GB/T15900-1995 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Chemical reagent
Sodium pyrosulfite
GB/T 15900--1995
This reagent is a white crystalline powder, soluble in water, with the smell of sulfur dioxide, and gradually oxidized to sodium sulfate in the air. Molecular formula: NaS,05
Relative molecular mass: 190.11 (according to the international relative atomic mass in 1991) 1 Subject content and scope of application
This standard specifies the technical requirements, test methods, inspection rules, packaging and marking of the chemical reagent sodium metabisulfite. This standard applies to the inspection of the chemical reagent sodium metabisulfite. 2 Reference standards
GB/T601 Preparation of standard solutions for titration analysis (volumetric analysis) of chemical reagents GB/T 602
Preparation of standard solutions for determination of impurities in chemical reagents GB/T603
Preparation of preparations and products used in test methods for chemical reagents General method for determination of arsenic in chemical reagents (arsenic spot method) GB/T 610.1
GB/T 619
Rules for sampling and acceptance of chemical reagents
Specifications and test methods for water used in analytical laboratories GB/T 6682
GB/T 9729
General method for determination of chloride in chemical reagents
GB/T 9735
GB/T 9738
GB/T9739
HG 3—119
HG 3—1168
3 Technical requirements
Chemical reagents
Chemical reagents
Chemical reagents
Chemical reagents
Chemical reagents
General method for determination of heavy metals
General method for determination of water-insoluble matter
General method for determination of iron
Packaging and marking
Preparation and determination method of clarity standards
3.1 Sodium metabisulfite (Naz2S,O,) Content: Analytical pure
Chemical pure
Maximum impurity content:
Approved by the State Bureau of Technical Supervision on December 20, 1995 ≥96.0%
≥94. 0%.
1996-08-01 implementation
Clarity test
Water insoluble matter
Chloride (CI)
Thiosulfate (S20)s)
Arsenic (As)
Iron (Fe)
Heavy metals (measured in Ph)
Test method
GB/T 15900-1995
Analytically pure
Chemically pure
The standard titration solution, impurity standard solution, preparation and product in this test method shall be prepared in accordance with the provisions of GB/T601, GB/T602 and GB/T603 unless otherwise specified. The experimental water shall meet the third-grade water specifications in GB/T6682. 4.1 Determination of sodium metabisulfite (Na2S.O.) content Weigh 0.2g of sample, accurate to 0.0001g. Place in an iodine volumetric flask pre-filled with 50.00mL of iodine standard titration solution [c(1/2Iz)=0.1mol/L], shake well, and leave for 5min. Add 2mL of hydrochloric acid solution (20%), and titrate with sodium thiosulfate standard titration solution [c(Na2S,O.)=0.1mol/L]. When near the end point, add 2mL of starch indicator solution (10g/L), and continue titrating until the blue color of the solution disappears. Perform a blank test at the same time.
The content of sodium metabisulfite is calculated as follows: (Vi - V2): c X 0. 047 53 ×X100
Wherein: r
mass percentage of sodium metabisulfite, %; Vi—volume of sodium thiosulfate standard titration solution consumed in blank test, mLV2--volume of sodium thiosulfate standard titration solution consumed by sample, mL; concentration of sodium thiosulfate standard titration solution, mol/L; 0. 047 53-
mass of sodium metabisulfite equivalent to 1.00mL sodium thiosulfate standard titration solution [c(Na,S,0;)=1.000mol/L], expressed in grams;
mass of sample, g.
4.2 Determination of impurities
The sample must be weighed accurately to 0.01g.
4.2.1 Clarity test
Weigh 10g of sample and dissolve it in 100mL of water. Its turbidity shall not be greater than the clarity standard specified in HG3-1168: analytically pure
chemically pure·
4.2.2 Water-insoluble matter
No. 3,
No. 5.
Weigh 20g of sample and dissolve it in 200mL of water. Keep it warm in a water bath for 1h. Filter it with a No. 4 glass filter that has been constant at 105±2℃. Wash the filter residue with hot water until there is no sulfite reaction in the washing liquid. Dry it in an electric oven at 105±2℃ to constant weight. The results are calculated according to the provisions of Chapter 7 of GB/T9738.
4.2.3 Chloride
Weigh 0.2g of sample, dissolve in 5mL of water, add 1mlL sodium hydroxide solution (100g/L), 2mL30% hydrogen peroxide, evaporate to dryness on a water bath, dissolve the residue in an appropriate amount of water, neutralize with nitric acid solution (25%), dilute to 20mL, and measure according to the provisions of GB/T9729. The turbidity of the solution shall not be greater than the standard.
GB/T15900-1995
The standard is to take the impurity standard solution containing the following amount of fluoride: analytical pure
chemical pure·
dilute to 20ml, and treat it in the same way as the sample solution of the same volume. 4.2.4 Thiosulfate
≥0.01 mgCl
≥0. 04 mgCl
Weigh 0.2g sample, dissolve in 5ml water, add 1mL nitric acid solution (17g/L) and 5mL nitric acid solution (25%), and place in the dark for 5min. The dark color of the solution shall not be darker than the standard. The standard is to take 0.1mg thiosulfate (S,O) impurity standard solution and treat it in the same way as the sample. 4.2.5bZxz.net
Weigh 1g sample, dissolve in 10mL water, add 1mL nitric acid and 1mL sulfuric acid, heat until sulfuric acid vapor escapes, cool, inject this solution into a ground-mouth conical flask, dilute to 70mL, and measure according to the provisions of GB/T610.1. The brown-yellow color of mercuric bromide test paper shall not be darker than the standard.
The standard is to take the impurity standard solution containing the following amount of arsenic: analytical pure ·
chemical pure
dilute to 70ml, and treat it in the same way as the sample solution of the same volume. 4.2.6 Iron
.≥0. 001 mgAs
:≥0. 002 mgAs
Weigh 1g of sample, dissolve it in 15mL of water, adjust the pH value of the solution to 2 with hydrochloric acid solution (15%), and measure it according to the provisions of GB/T9739. The red color of the solution shall not be darker than that of the standard. The standard is to take the impurity standard solution containing the following amount of iron: analytical pure ·
chemical pure ·
treat it in the same way as the sample.
4.2.7 Heavy metals
≥0. 005 mgFe
≥0.020 mgFe
Weigh 4g of sample, dissolve in 20mL of hot water, add 4mL of hydrochloric acid, evaporate to dryness on a water bath, add 10mL of hot water and 2mL of hydrochloric acid, evaporate to dryness again, dissolve the residue in 10mL of water, neutralize with ammonia solution (10%), and dilute to 20ml. Take 15mL and measure according to the provisions of GB/T9735. The dark color of the solution shall not be darker than the standard. The standard is to take the remaining 5ml. Sample solution and impurity standard solution containing the following amounts of lead: analytical pure
chemical pure
Diluted to 15ml, and treated in the same way as the same volume of sample solution. 5 Inspection rules
Sampling and acceptance shall be carried out according to the provisions of GB/T619. 6 Packaging and marking
According to the provisions of HG3--119, among which:
Inner packaging form: G-3, Gz-3;
Outer packaging form: W-3, W-5;
Packing unit: Class 4.
·≥0.01 mgPb
≥0.04 mgPb
Additional Notes:
GB/T 15900—1995
This standard is proposed by the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of Beijing Chemical Reagent General Factory. This standard was drafted by Shanghai Reagent Factory No. 4. The main drafters of this standard are Li Baozhen and Jia Ling. From the date of implementation of this standard, the former industry standard HG3-909-76 "Chemical Reagent Sodium Metabisulfite" of the Ministry of Chemical Industry will be invalid. 816
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