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Standards GB - Chinese national standards - Page 6034
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 14420-1993
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Analysis of water used in boiler and cooling system—Determination of chemical oxygen demand—Rapid method with potassium dichromate
WITHDRAWN published on 24.4.1993
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GB/T 14420-2014
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Analysis of water used in boiler and cooling system—Determination of chemical oxygen demand—Rapid method with potassium dichromate
WITHDRAWN published on 8.7.2014
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GB/T 14421-1993
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Analysis of water used in boiler and cooling system—Determination of polyacrylic acid—Turbidimetric method
WITHDRAWN published on 24.4.1993
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GB/T 14422-1993
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Analysis of water used in boiler and cooling system—Determination of benzotriazole—Ultraviolet spectrophotometry
WITHDRAWN published on 24.4.1993
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GB/T 14423-1993
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Analysis of water used in boiler and cooling system—2-Mercaptobenzothiazole—Ultraviolet spectrophotometry
WITHDRAWN published on 24.4.1993
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GB/T 14424-1993
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Analysis of water used in boiler and cooling system—Determination of free chlorine residuals
WITHDRAWN published on 24.4.1993
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GB/T 14425-1993
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Analysis of water used in boiler and cooling system—Determination of sulfurated hydrogen—Spectrophotometry
WITHDRAWN published on 24.4.1993
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GB/T 14426-1993
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Analysis of water used in boiler and cooling system—Determination of sulfite
WITHDRAWN published on 24.4.1993
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GB/T 14427-1993
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Analysis of water used in boiler and cooling system—Determination of iron
WITHDRAWN published on 24.4.1993
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GB/T 14427-2008
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Analysis of water used in boiler and cooling system—Determination of iron
WITHDRAWN published on 1.4.2008
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