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Standards GB - Chinese national standards - Page 215
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 12689.3-2004
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The methods forchemical analysis of zinc and zinc alloys--The determination of cadmium content--The flame atomic absorption spectrometric method
Standard published on 30.4.2004
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GB/T 12689.4-2004
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The methods for chemical analysis of zinc and zinc alloys--The determination of copper content--The lead diethyldithio-carbamate spectrophotometric method and the flame atomic absorption spectrometric method and the electrolytic method
Standard published on 30.4.2004
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GB/T 12689.5-2004
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The methods for chemical analysis of zinc and zinc alloys--The determination of iron content--The sultosalicylic acid spectrometric method and the flame atomic absorption spectrometric method
Standard published on 30.4.2004
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GB/T 12689.6-2004
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The methods for chemical analysis of zinc and zinc alloys--The determination of lead content--The oscillopolarographic method
Standard published on 30.4.2004
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GB/T 12689.7-2010
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Methods for chemical analysis of zinc and zinc alloys - Part 7Determination of magnesium content - Flame atomic absorption spectrometric method
Standard published on 14.1.2011
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GB/T 12689.8-2004
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The methods for chemical analysis of zinc and zinc alloys--The determination of silicon content--The molybdenum blue spectrophotometric method
Standard published on 30.4.2004
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GB/T 12689.9-2004
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The methods for chemical analysis of zinc and zinc alloys--The determination of antimony content--The atomic fluorescence spectrometer and the flame atomic absorption spectrometric method
Standard published on 30.4.2004
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GB/T 12690.1-2022
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Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides—Part 1Determination of carbon and sulfur contents—High frequency-infrared absorption method
Standard published on 30.12.2022
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GB/T 12690.10-2003
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Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides--Determination of phosphorus content by molybdenum blue spectrophotometric method
Standard published on 18.11.2003
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GB/T 12690.11-2025
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Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides— Part 11: Determination of magnesium content—Flame atomic absorption spectrometric method
Standard published on 1.8.2025
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