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GB 23937-2009 English PDF (GB23937-2009)

GB 23937-2009 English PDF (GB23937-2009)

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GB 23937-2009: [GB/T 23937-2009] Sodium hydrosulfide for industrial use

This Standard specifies the requirements, test methods, inspection rules, marking, labeling, packaging, transportation, storage and safety of sodium hydrosulfide for industrial use. This Standard is applicable to sodium hydrosulfide for industrial use, and the product is mainly used for beneficiation, pesticide, leather, dye production, organic synthesis and other industries.
GB 23937-2009
ICS 71.060.50
G 12
NATIONAL STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
Sodium hydrosulfide for industrial use
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ISSUED ON. JUNE 02, 2009
IMPLEMENTED ON. FEBRUARY 01, 2010
Issued by.
General Administration of Quality Supervision, Inspection
and Quarantine of the PEOPLE Republic of China;
Standardization Administration of the PEOPLE Republic of
China
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Molecular formula and relative molecular mass ... 5
4 Classification and appearance ... 5
5 Requirements ... 5
6 Test methods ... 5
7 Inspection rules ... 10
8 Marking and labeling ... 11
9 Packaging, transportation and storage ... 11
10 Safety ... 12
Foreword
Clause 7, Clause 8, Clause 9 and Clause 10 in this Standard are mandatory, the rest are recommendatory.
This Standard is proposed by China Petroleum and Chemical Industry Association. This Standard is under the jurisdiction of Inorganic Chemical Industry Sub-committee of National Technical Committee on Chemical of Standardization Administration of China (SAC/TC 63/SC 1).
The responsible drafting organizations are. CNOOC Tianjin Chemical Research and Design Institute, Nafine Chemical Industry Group Co., Ltd and Dongying Sanxie Chemical Co., Ltd.
The chief drafting staffs of this Standard. Fan Guoqiang, Zhang Tiezhu, Chen Aibing, Wei Junwen and Li Zhiqi.
This Standard is issued for the first time.
Sodium hydrosulfide for industrial use
1 Scope
This Standard specifies the requirements, test methods, inspection rules, marking, labeling, packaging, transportation, storage and safety of sodium hydrosulfide for industrial use.
This Standard is applicable to sodium hydrosulfide for industrial use, and the product is mainly used for beneficiation, pesticide, leather, dye production, organic synthesis and other industries.
2 Normative references
The articles contained in the following documents have become part of this Standard when they are quoted herein. For the dated documents so quoted, all the modifications (excluding corrections) or revisions made thereafter shall not be applicable to this Standard. For the undated documents so quoted, the latest editions shall be applicable to this Standard.
GB 190-1990 Labels for packages of dangerous goods
GB/T 191-2008 Packaging - Pictorial marking for handling of goods (ISO 780. 1997, MOD)
GB/T 3049-2006 Chemical products for industrial use - General method for determination of iron content ?€? 1,10-Phenanthroline spectrophotometric method (ISO 6685. 1982, IDT) GB/T 6682-2008 Water for analytical laboratory use - Specification and test methods (ISO 3696. 1987, MOD)
GB/T 8170 Rules of rounding off for numerical values and expression and judgment of limiting values
HG/T 3696.1 Inorganic chemical products Preparations of standard volumetric solutions for chemical analysis
HG/T 3696.2 Inorganic chemical products Preparations of standard solutions for chemical analysis
weighing bottle. TRANSFER all of them into a 500mL volumetric flask with 15mL barium chloride solution in it. ADD small amount of water to dissolve them, SHAKE well, LET it stand for 10 min. DILUTE with water to the graduation, MIX well.
CONDUCT dry filtration with medium-speed filter paper, DISCARD 20mL primary filtrate, COLLECT the filtrate in a 500mL dry conical flask, filtrate volume shall be just enough for the test, COVER the rubber plug well, this solution is the test solution A, it is used for the determination of sodium hydrosulfide content, sodium sulfide content, and iron content. CALCULATE the mass (m) of sodium hydrosulfide solid in the fully soluble sample solution according to formula (1).
Where.
m1 ?€? The value of the mass of fully soluble sample solution prepared, the unit is in g; m2 ?€? The value of the net mass of the dissolved sodium hydrosulfide, the unit is in g; m3 ?€? The value of the mass of fully soluble sample solution weighed with weighing bottle, the unit is in g.
6.3.4.2 Determination
TAKE 25mL solution A, PUT it in 250mL conical flask, ADD 20mL water, ADD 10 drops of alizarin yellow GG - thyme phenol blue mixed indicator liquid. TITRATE with titration solution of hydrochloric acid standard, when the solution?€?s color turns from green to blue, it is deemed as the first end point. Then ADD 5mL formaldehyde and 3 drops of phenolphthalein indicating liquid, CONTINUE to use hydrochloric acid standard titration solution to titrate, when the red disappears from the solution, it is deemed as the second end point.
6.3.5 Result calculation
6.3.5.1 Sodium hydrosulfide content is calculated based on the mass fraction of sodium hydrosulfide (NaHS) w1, represented by the figures in the form of %, and calculated according to the formula (2).
Within the pH value of 2 - 9, bivalent iron and phenanthroline generate red complex, USE spectrophotometer to measure the absorbance under the maximum absorption wavelength (510 nm).
6.4.2 Reagents and materials
6.4.2.1 Sulfuric acid solution. 1+5;
6.4.2.2 Other reagents are same as GB/T 3049-2006, Chapter 3.
6.4.3 Instrument and apparatus
6.4.3.1 Porcelain crucible. 50mL;
6.4.3. Other equipment are same as GB/T 3049-2006, Chapter 4.
6.4.4 Analytical steps
6.4.4.1 Drawing of working curve
DRAW the working curve according to the provisions of 6.3 in GB/T 3049-2006. 6.4.4.2 Determination
WEIGH about 2 g liquid sample or fully soluble sample solution, PUT it into 50mL porcelain crucible. TITRATE 4mL of sulfuric acid solution in the fume cupboard. PLACE the porcelain crucible on the furnace and HEAT it till sulfuric acid is totally removed. PLACE the porcelain crucible in the high temperature furnace and BURN it under 600 ??C for 10 min. COOL it, ADD 1mL 1 + 1 hydrochloric acid solution and right amount of water, HEAT it to dissolve the residue. After cooling, TRNASFER the solution into 100mL volumetric flask, according to the provisions of 6.4 in GB/T 3049-2006, starting from "when necessary, ADD water to about 60mL", PERFORM operation to the test solution. Meanwhile, CARRY out a blank test, blank test refers to - not adding sample during preparing test solution, while addition of other reagents is the same as that during handling samples.
6.4.5 Result calculation
The iron content is calculated based on iron (Fe) mass fraction w3, represented by the figures in the form of %, and calculated according to the formula (4).
Where.
9.1 Solid sodium hydrosulfide for industrial use adopts metal drum as its package or other packages consistent with storage and transportation safety requirements at customer's request. Net content per package unit is 25 kg, 50 kg or 150 kg respectively; Liquid product is loaded and transported with a metal drum or tank truck with a net content of 200 kg per drum.
9.2 Sodium hydrosulfide for industrial product use shall be stored in a cool, dry and ventilated warehouse, kept from drench, damp and heat, and must not contact with acid and corrosive materials.
9.3 Transportation of sodium hydrosulfide for industrial use product shall be kept from sun, rain, heat, and maintained with intact packaging.
9.4 The warranty of sodium hydrosulfide for industrial use is one year under the room temperature below 20??C, relative humidity not more than 60% and intact packaging. 10 Safety
10.1 Production site must be well ventilated. And it shall be equipped with a warning device of hydrogen sulfide gas and necessary protection equipment used in case of a gas leak.
10.2 During the process of analytical inspection, there is emitted hydrogen sulfide gas, it shall be carried out in the fume cupboard with good ventilation.

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