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Standards GB - Chinese national standards - Page 5126
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 6730.31-2017
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Iron ores—Determination of vanadium—N-benzoyl-N-phenylhydroxylamine extraction spectrophotometric method
Standard published on 7.9.2017
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GB/T 6730.32-2013
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Iron ores - Determination of vanadium content - The ammonium ferrous sulfate titrimetric method
Standard published on 9.5.2013
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GB/T 6730.34-2017
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Iron ores—Determination of tin content—Pyrocatechol violet cetyl trimet hylamine bromide spectrophotometric method
Standard published on 7.9.2017
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GB/T 6730.34-2017E
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Iron ores—Determination of tin content—Pyrocatechol violet cetyl trimet hylamine bromide spectrophotometric method
Standard published on 7.9.2017
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GB/T 6730.35-2016
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Iron ores—Determination of copper content—Oxalic acid bis-cyclohexylidene hydragide (cuprizone) spectrophotometric method
Standard published on 13.10.2016
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GB/T 6730.36-2016
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Iron ores—Determination of cupper content—Flame atomic absorption spectrometric method
Standard published on 24.2.2016
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GB/T 6730.37-2017
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Iron ores—Determination of cobalt content—4-[(5-chloro-2-pyridyl)azo]-1,3-diamino-benzene spectrophotometric method
Standard published on 7.9.2017
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GB/T 6730.38-2017
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Iron ores—Determination of cobalt content—Nltroso-R salt spectrophotometric method
Standard published on 7.9.2017
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GB/T 6730.38-2017E
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]Iron ores—Determination of cobalt content—Nitroso-R salt spectrophotometric method
Standard published on 7.9.2017
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GB/T 6730.39-2017
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Iron ores—Determination of nickle content—Dimetylglyoxime spectrophotometric method
Standard published on 7.9.2017
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