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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
Analysis of water used in boil and cooling system—General rule
WITHDRAWN published on 6.2.2005
Selected format:Methods for analysis ofwater for boiler and for cooling--The determination of pH--The glass electrode method
WITHDRAWN published on 16.9.1986
Selected format:Methods for analysis of water for boiler and for cooling--The determination of pH--Colorimetric method
WITHDRAWN published on 16.9.1986
Selected format:Analysis of water used in boiler and cooling system—Determination of pH—The glass electrode method for pure water
WITHDRAWN published on 24.4.1993
Selected format:Methods for analysis ofwater for boiler and for cooling--The determination of chloride--The Mohr method
WITHDRAWN published on 16.9.1986
Selected format:Methods for analysis of water for boiler and for cooling--The determination of chloride--Potentiometric titration
WITHDRAWN published on 16.9.1986
Selected format:Methods for analysis of water for boiler and for cooling--The determination of chloride--Method of mercurimetric titration
WITHDRAWN published on 16.9.1986
Selected format:Analysis of water used in boiler and cooling system—Determination of chloride—Coprecipitation concentration and spectrophotometry
WITHDRAWN published on 24.4.1993
Selected format:Methods for analysis of water for boiler and for cooling—The determination of hydrazine
WITHDRAWN published on 16.9.1986
Selected format:Methods for analysis of water for boiler and for cooling--The sampling method for water
WITHDRAWN published on 16.9.1986
Selected format:Latest update: 2026-04-10 (Number of items: 2 271 455)
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