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Standards GB - Chinese national standards - Page 8443
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 6730.22-1986
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Methods for chemical analysis of iron ores The diantipyrine methane photometric method for the determination of titanium content
WITHDRAWN published on 19.8.1986
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GB/T 6730.23-1986
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Methods for chemical analysis of iron ores The ferric ammonium sulfate volumetric method for the determination of titanium content
WITHDRAWN published on 19.8.1986
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GB/T 6730.23-2006
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Iron ores - Determination of titanium content - The ferric ammonium sulfate titrimetric method
WITHDRAWN published on 1.11.2006
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GB/T 6730.24-1986
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Methods for chemical analysis of iron ores The arsenazo photometric method for the determination of rare earth elements content
WITHDRAWN published on 19.8.1986
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GB/T 6730.24-2006
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Iron ores - Determination of total rare earth contents - Chlorophosphonazo mA spectrophotometric method
WITHDRAWN published on 1.11.2006
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GB/T 6730.25-1986
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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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