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Standards GB - Chinese national standards - Page 8881
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 6730.25-1986
WITHDRAWN
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Methods for the chemical analysis of iron ores—The gravimetric method for the determination of rare earth elements content
WITHDRAWN published on 19.8.1986
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GB/T 6730.25-2006
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Iron ores—Determination of total rare earth contents—Oxalate gravimetric method
WITHDRAWN published on 1.11.2006
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GB/T 6730.26-1986
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Methods for chemical analysis of iron ores The thorium nitrate volumetric method for the determination of fluorine content
WITHDRAWN published on 19.8.1986
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GB/T 6730.27-1986
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Methods for chemical analysis of iron ores The lanthanum-alizarin complexon photometric method for the determination of fluorine content
WITHDRAWN published on 19.8.1986
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GB/T 6730.28-1986
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Methods for chemical analysis of iron ores The ion-selective electrode method for the determination of fluorine content
WITHDRAWN published on 19.8.1986
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GB/T 6730.28-2006
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Iron ores—Determination of fluorine content—Ion-selective electrode method
WITHDRAWN published on 16.8.2006
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GB/T 6730.29-1986
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Methods for chemical analysis of iron ores The barium sulfate grarimetric method for the determination of barium content
WITHDRAWN published on 19.8.1986
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GB/T 6730.3-1986
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Methods for chemical analysis of iron ores The gravimetric method for the determination of hygroscopic moisture content in analytical samples
WITHDRAWN published on 19.8.1986
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GB/T 6730.30-1986
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Methods for chemical analysis of iron ores The diphenyl carbazide photometric method for the determination of chromium content
WITHDRAWN published on 19.8.1986
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GB/T 6730.31-1986
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Methods for chemical analysis of iron ores The benzoylphenyl-hydroxylamine extraction photometric method for the determination of vanadium content
WITHDRAWN published on 19.8.1986
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