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Standards GB - Chinese national standards - Page 8481
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 6911-2007
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Water for industrial circulating cooling system and boiler—Determination of sulfate
WITHDRAWN published on 13.8.2007
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GB/T 6911.1-1986
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Methods for analysis ofwater for boiler and for cooling--The determination of sulfate--Gravimetric method
WITHDRAWN published on 16.9.1986
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GB/T 6911.2-1986
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Methods for analysis of water for boiler and for cooling--The determination of sulfate--Photometric method as barium chromate
WITHDRAWN published on 16.9.1986
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GB/T 6911.3-1986
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Methods for analysis of water for boiler and for cooling--The determination of sulfate--Potentiometric titration method
WITHDRAWN published on 16.9.1986
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GB/T 6912.1-1986
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Methods for analysis of water for boiler and for cooling—The determination of nitrates and nitrites—Ultraviolet spectrophotometry for nitrates
WITHDRAWN published on 16.9.1986
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GB/T 6912.2-1986
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Methods for analysis of water for boiler and for cooling—The determination of nitrates and nitrites— Ultraviolet spectrophotometry for nitrites
WITHDRAWN published on 16.9.1986
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GB/T 6912.3-1986
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Methods for analysis of water for boiler and for cooling—The determination of nitrates and nitrites—Alpha-naphthylamine hydrochloride photometric method
WITHDRAWN published on 16.9.1986
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GB/T 6913-2008
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Analysis of water used in boiler and cooling system—Determination of phosphorus
WITHDRAWN published on 1.4.2008
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GB/T 6913.1-1986
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Methods for analysis of water for boiler and for cooling—The determination of phosphates—Orthophosphates
WITHDRAWN published on 16.9.1986
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GB/T 6913.2-1986
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Methods for analysis of water for boiler and for cooling—The determination of phosphates—Total inorganic phosphates
WITHDRAWN published on 16.9.1986
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