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Standards GB - Chinese national standards - Page 7499
Standards GB are Chinese national standards, which are issued by China's Standardization Administration Office (SAC).
Chinese national standards are used all over China commonly labeled as GB standards. They determine the united production requirements regarding product safety and quality .
GB standards are often modified or created according to the international standards of ISO, IEC or any other international level.
Although, they are largely harmonized, GB standards may differ from international standards .
Approximately 15% of all GB standards are obligatory and they can be identified according to the prefix GB, after which the code of the standards follows:
GB – Obligatory national standards
GB/T – Optional national standards
GB/Z – National steering technical document
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GB/T 3257.4-1999
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Methods for chemical analysis of bauxite—Determination of iron oxide content—Dichromate titrimetric method
WITHDRAWN published on 30.8.1999
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GB/T 3257.5-1999
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Methods for chemical analysis of bauxite—Determination of iron oxide content—Orthophenanthroline photometric method
WITHDRAWN published on 30.8.1999
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GB/T 3257.6-1999
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Methods for chemical analysis of bauxite—Determination of titanium dioxide content—Diantipyrylmethane photometric method
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GB/T 3257.7-1999
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Methods for chemical analysis of bauxite—Determination of calcium oxide content—Flame atomic absorption spectrophotometric method
WITHDRAWN published on 30.8.1999
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GB/T 3257.8-1999
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Methods for chemical analysis of bauxite—Determination of magnesium oxide content—Flame atomic absorption spectrophotometric method
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GB/T 3257.9-1999
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Methods for chemical analysis of bauxite—Determination of potassium oxide and sodium oxide content—Flame atomic absorption spectrophotometric method
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GB 3258.1-1982
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Chemical analysis of bismuth concentrates--The EDTA volumetric method for determination of bismuth
WITHDRAWN published on 1.1.1982
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GB 3258.10-1982
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Chemical analysis of bismuth concentrates--The chromazurol S photometric method for determination of aluminium oxide
WITHDRAWN published on 1.1.1982
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GB 3258.11-1982
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Chemical analysis of bismuth concentrates--The atomic absorption spectrophotometric method for determination of silver
WITHDRAWN published on 1.1.1982
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GB 3258.12-1982
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Chemical analysis of bismuth concentrates--The atomic absorption spectrophotometric method for determination of lead and copper
WITHDRAWN published on 1.1.1982
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