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The provisions in chapter 7, 8 and 9 in this standard are compulsory, and the others are recommended.
This standard is un-equivalent to Japanese Standard JIS: 1986 "Sodium Sulfide for Industrial Use" (Japanese edition) in correspondence degree.
This standard replaces GB/T 10500-2000 "Sodium Sulfide for Industrial Use", and has the following technical differences from GB/T 10500-2000:
——cancel Class 3 products (4.2 in Edition 2000).
——reset Class 1 and 2 products and grade; Class 1 product is low-iron sodium sulfide and Class 2 is common sodium sulfide; raise the iron content and water-insoluble substance of the products in all classes (4.2 in Edition 2000; chapter 5 in this edition).
——revise the full-dissolve sampling method (6.3.1 in edition 2000; 7.3.1 in this edition).
This standard is proposed by the China Petroleum and Chemical Industry Association.
This standard is under the jurisdiction of the inorganic chemical industry branch of the National Technical Committee on Chemistry of Standardization Administration of China (SAC/TC 63/SC 1).
Chief drafting organizations: CNOOC Tianjin Chemical Research and Design Institute, China Nafine Group International Co., Ltd., Inner Mongolia Elion Resources Group Company
Chief drafting staffs: Fan Guoqiang, Chen Aibing, Wang Shuizan, Wang Shangjun
All previously replaced editions hereof are as:
——GB/T 10500-1989, GB/T 10500-2000.
Contents
1 Scope 1
2 Normative References 1
3 Molecular Formula and Relative Molecular Mass 1
4 Classification and Appearance 2
5 Requirements 2
6 Testing Method 2
7 Testing Rules 10
8 Marking and Labeling 11
9 Packing, Transporting and Storage 11
Sodium Sulfide for Industrial Use
1 Scope
This standard specifies the requirements, testing method, inspection rules, marking, labeling, packing, transporting and storage of sodium sulfide for industrial use.
This standard is applicable to lump, flaky and grainy sodium sulfide for industrial use, which is used in fields like paper making, dyestuff, mineral processing and printing.
2 Normative References
Provisions of the following documents, through reference in this standard, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties whose enter into agreement according to these specifications are encouraged to research whether the latest editions of these labels are applied or not. For undated references, the latest editions of the normative documents are 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 (6685: 1982, IDT)
GB/T 6682-2008 Water for analytical laboratory use - Specification and test methods (ISO 3696: 1987, MOD)
GB/T 8170-2008 Rules of rounding off for numerical values & expression and judgement 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
HG/T 3696.3 Inorganic chemical products Preparations of reagent solutions for chemical analysis
3 Molecular Formula and Relative Molecular Mass
Molecular formula: Na2S
Relative molecular mass: 78.04 (International Relative Atomic Mass, 2007)
4 Classification and Appearance
4.1 Sodium sulfide product for industrial use, by production process, is classified into low-iron sodium sulfide and common sodium sulfide.
4.2 Appearance: yellow or reddish-brown lump, flake and grain.
5 Requirements
The sodium sulfide for industrial use shall meet the requirement of Table 1.
Table 1: Requirements
Index item Index
Class 1 Class 2
Superior product Quality product Accepted product Superior product Quality product
Sodium sulfide (Na2S), w/% ≥ 60.0 60.0 60.0 60.0 60.0
Sodium sulfite (Na2SO3), w/% ≤ 1.0 — — — —
Sodium hyposulfite (Na2S2O3), w% ≤ 2.5 — — — —
Iron (Fe), w/% ≤ 0.0020 0.0030 0.0050 0.015 0.030
Water-insoluble substance, w/% ≤ 0.05 0.05 0.05 0.15 0.20
Sodium carbonate, w/% ≤ 2.0 — — 3.5 —
6 Testing Method
6.1 Safety notice
The strong acid, strong base and their specimen used in this standard have corrosivity, so they shall be operated carefully and prevented from being spilled; the volatile organic solvent is harmful to human health and flammable, so it shall be operated in ventilated cupboard, and prevented from contacting with naked flame.
6.2 General requirements
Unless otherwise specified, the reagent and water used in this standard refer to analytical reagent and Class 3 water specified in GB/T 6682-2008; and the standard titrant, impurity reference solution, preparation and product used in the tests shall be prepared according to the requirements of HG/T 3696.1, HG/T 3696.2 and HG/T 3696.3.
6.3 Preparation of test solution
6.3.1 Test solution A: with a weighing bottle of a given mass, weigh 30g full-dissolve test sample solution (7.3.1), accurate to 0.01 g; transfer it into a 1000mL volumetric flask; dilute it to the scale with water free of carbon dioxide, and shake up. This solution is test solution A.
The mass (m) of sodium sulfide solid sample is calculated according to formula (1):
(1)
Where,
m1 ——mass value of full-dissolve test sample solution prepared (g);
m2 ——mass of dissolve sodium sulfide (g);
m3 ——mass value of the full-dissolve test sample solution weighed by the weighing bottle (g).
6.3.2 Test solution B: weigh about 10g of solid sample, accurate to 0.01 g, place it in a beaker, add with 100mL of water, and heat to dissolving; transfer the solution to a 1000mL volumetric flask; dilute it to the scale with water free of carbon dioxide, and shake up. This solution is test solution B.
Test solution A or B are used for the determination for the contents of sodium sulfide, sodium sulfite, sodium hyposulfite, iron and sodium carbonate.
1 Scope
2 Normative References
3 Molecular Formula and Relative Molecular Mass
4 Classification and Appearance
5 Requirements
6 Testing Method
7 Testing Rules
8 Marking and Labeling
9 Packing, Transporting and Storage
