Foreword
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
Attention is drawn to the possibility that some of the elements of this standard may be the subject of patent rights. The issuing authority of this standard shall not be held responsible for identifying any or all such patent rights.
This standard was proposed by the China Petroleum and Chemical Industry Association.
This standard is under the jurisdiction of the Subcommittee on Inorganic Chemical Industry of National Technical Committee on Chemical of Standardization Administration of China (SAC/TC63/SC1).
Sodium bisulfite for industrial use
1 Scope
This standard specifies the requirements, test methods, inspection rules, marking, labeling, packaging, transportation, and storage of sodium bisulfite for industrial use.
This standard is applicable to sodium bisulfite for industrial use, which is mainly used for bleaching cotton fabrics and as a reducing agent in dyes, paper making, leather making, chemical synthesis, and other industries. It may also be used to synthesize intermediates, antichlors, mordants, and depigmenting agents of organic drugs.
Molecular formula: NaHSO3
Relative molecular mass: 104.06 (as per the international relative atomic mass in 2001)
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) to, or revisions, of any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition applies.
GB/T 191-2000 Packaging - Pictorial marking for handling of goods (eqv ISO 780: 1997)
GB/T 1250 Rules for expression and judgment of limiting values
GB/T 3049-1986 Chemical products for industrial use - General method for determination of iron content - o-Phenanthroline spectrophotometric method (eqv ISO 6685: 1982)
GB/T 3050-2000 Inorganic chemical products for industrial use - General method for determination of chloride content - Potentiometric method
GB/T 5009.74-2003 Method for limit test of heavy metals in food additives
GB/T 5009.76-2003 Determination of arsenic in food additives (Method II Gutzeit method)
GB/T 6678 General principles for sampling chemical products
GB/T 6682-1992 Water for analytical laboratory use - Specification and test methods (eqv ISO 3696: 1987)
GB/T 8946 Plastic woven sack
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 Requirements
3.1 Appearance: Sodium bisulfite for industrial use is white crystal powder.
3.2 Sodium bisulfite for industrial use shall meet those specified in Table 1.
Table 1 Requirements
Item Index
Mass fraction of the main content (in SO2)/% 64.0 to 67.0
Mass fraction of water insoluble matter/% ≤ 0.03
Mass fraction of chloride (in Cl)/% ≤ 0.05
Mass fraction of iron (Fe)/% ≤ 0.004
Mass fraction of arsenic (As)/% ≤ 0.000 2
Mass fraction of the heavy metal (in Pb)/% ≤ 0.001
pH (50g/L solution) 4.0 to 5.0
4 Test methods
4.1 Safety instruction
Some of the reagents used in this test method are toxic or corrosive and must be handled with care. In case of splashing to the skin, rinse it immediately with water. In severe cases, seek medical treatment immediately. When flammable materials are used, open flame heating is strictly prohibited.
Foreword i
1 Scope
2 Normative references
3 Requirements
4 Test methods
5 Inspection rules
6 Marking and labeling
7 Packaging, transportation and storage
