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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
Workplace air—Determination of hydrogen cyanide and cyanides—Sodium isonicotinate-sodium barbiturate spectrophotometric method
WITHDRAWN published on 23.1.1996
Selected format:Workplace air—Determination of arsenic trioxide and pentoxide—Silver diethyl dithiocarbamate spectrophotometric method
WITHDRAWN published on 23.1.1996
Selected format:Workplace air --Determination of arsine -- Silver diethyl dithiocarbamate spectrophotometric method
WITHDRAWN published on 23.1.1996
Selected format:Workplace air—Determination of phosphorus pentoxide—Ammonium molybdate spectrophotometric method
WITHDRAWN published on 23.1.1996
Selected format:Workplace air—Determination of phosphine—Ammonium molybdate spectrophotometric method
WITHDRAWN published on 23.1.1996
Selected format:Workplace air—Determination of solvent naphthas—Direct injection gas chromatographic method
WITHDRAWN published on 23.1.1996
Selected format:Workplace air—Determination of solvent naphthas—Thermal desorption gas chromatographic method
WITHDRAWN published on 23.1.1996
Selected format:-
WITHDRAWN published on 1.1.1979
Selected format:Workplace air—Determination of butadiene—Direct injection gas chromatographic method
WITHDRAWN published on 23.1.1996
Selected format:Workplace air—Determination of cyclohexane—Direct injection gas chromatographic method
WITHDRAWN published on 23.1.1996
Selected format:Latest update: 2025-11-09 (Number of items: 2 243 571)
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