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Standards GB - Chinese national standards - Page 8371
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 6150.13-1985
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Methods for chemical analysis of tungsten concentrates—The ammonium hydroxide-ammonium chloride supporting electrolyte polarographic method for the determination of zinc content
WITHDRAWN published on 21.6.1985
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GB/T 6150.13-2008
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Methods for chemical analysis of tungsten concentrates—Determination of arsenic content—Hydride reduction atomic absorption spectrometry and the silver diethyldithiocarbamate(DDTC-Ag) photometry
WITHDRAWN published on 17.6.2008
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GB/T 6150.14-1985
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Methods for chemical analysis of tungsten concentrates—The molybdenum blue photometric method for the determination of silicon dioxide content
WITHDRAWN published on 21.6.1985
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GB/T 6150.15-1985
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Methods for chemical analysis of tungsten concentrates—The silver diethyldithiocarbamate photometric method for the determination of arsenic content
WITHDRAWN published on 21.6.1985
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GB/T 6150.15-2008
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Methods for chemical analysis of tungsten concentrates—Determination of bismuth content—Flame atomic absorption spectrometric method
WITHDRAWN published on 31.3.2008
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GB/T 6150.16-1985
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Methods for chemical analysis of tungsten concentrates—The atomic absorption spectrophotometric method for the determination of manganese content
WITHDRAWN published on 21.6.1985
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GB/T 6150.17-1985
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Methods for chemical analysis of tungsten concentrates—The semi-xylenol orange photometric method for the determination of bismuth content
WITHDRAWN published on 21.6.1985
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GB/T 6150.17-2008
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Methods for chemical analysis of tungsten concentrates—Determination of antimony content—Hydride reduction atomic absorption spectrometry
WITHDRAWN published on 17.6.2008
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GB/T 6150.18-1985
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Methods for chemical analysis of tungsten concentrates—The sulphosalicylic acid photometric method for the determination of iron content
WITHDRAWN published on 21.6.1985
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GB/T 6150.19-1985
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Methods for chemical analysis of tungsten concentrates—The 2-(5-bromo pyridylazo)-5-diethylaminophenol photometric method for the determination of antimony content
WITHDRAWN published on 21.6.1985
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