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Standards GB - Chinese national standards - Page 5758
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 12690.16-1990
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Rare-earthmetals and their oxides--Determination of calcium content--Flame atomic absorption spectrometric method
WITHDRAWN published on 30.12.1990
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GB/T 12690.17-1990
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Rare-earth metals and their oxides--Determination of calcium content--Nitrous oxide-acetylene flame atomic absorption spectrometric method
WITHDRAWN published on 30.12.1990
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GB/T 12690.18-1990
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Rare-earth metals and their oxides--Determination of chlorine content--Mercury sulphoeyanie-iron nitrate spectrophotometric method
WITHDRAWN published on 1.1.1990
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GB/T 12690.19-1990
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Rare-earth metals and their oxides--Determination of iron content--110-phenanthroline spectrophotometric method
WITHDRAWN published on 30.12.1990
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GB/T 12690.2-1990
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Lanthanum oxide--Determination of neodymium oxide, cerium oxide, praseodymium oxide, samarium oxide and yttrium oxide contents-Emission spectrographic method
WITHDRAWN published on 1.1.1990
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GB/T 12690.2-2002
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Chemical analysis methods for non—RE impurity of rare earth metals and their oxides—Determination of ignition loss content of rare earth oxides—Gravimetric method
WITHDRAWN published on 19.11.2002
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GB/T 12690.20-1990
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Rare-earth metals and their oxides--Determination of iron content--Potassium thiocyanate, 1, 10-phenanthroline spectrophotometric method
WITHDRAWN published on 1.1.1990
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GB/T 12690.21-1990
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Rare-earth metals and their oxides--Determination of phosphorus content--Molybdenum blue spectrophotometric method
WITHDRAWN published on 1.1.1990
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GB/T 12690.22-1990
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Rare-earth metals and their oxides--Determination of silicon oxide--Molybdenum blue spectrophotometric method
WITHDRAWN published on 1.1.1990
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GB/T 12690.23-1990
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Rare-earth metals and their oxides--Determination of acid soluble silicon oxide--Molybdenum blue spectrophotometric method
WITHDRAWN published on 1.1.1990
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