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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
Methods for chemical analysis of tungsten ores and molybdenum ores - Part 13Determination of tin content
Standard published on 10.11.2010
Selected format:Methods for chemical analysis of tungsten ores and molybdenum ores - Part 14Determination of gallium content
Standard published on 10.11.2010
Selected format:Methods for chemical analysis of tungsten ores and molybdenum ores - Part 15Determination of germanium content
Standard published on 10.11.2010
Selected format:Methods for chemical analysis of tungsten ores and molybdenum ores - Part 16Determination of selenium content
Standard published on 10.11.2010
Selected format:Methods for chemical analysis of tungsten ores and molybdenum ores - Part 17Determination of tellurium content
Standard published on 10.11.2010
Selected format:Methods for chemical analysis of tungsten ores and molybdenum ores - Part 18Determination of rhenium content
Standard published on 10.11.2010
Selected format:Methods for chemical analysis of tungsten ores and molybdenum ores—Part 19:Determination of bismuth,cadmium,cobalt,copper,iron,lithium,nickel,phosphorus,lead,strontium,vanadium and zinc content—Inductive-coupled plasma atomic emission spectrophotometry(ICP-AES)
Standard published on 9.3.2021
Selected format:Methods for chemical analysis of tungsten ores and molybdenum ores—Part 2:Determination of molybdenum content
Standard published on 10.11.2010
Selected format:Methods for chemical analysis of tungsten ores and molybdenum ores—Part 20:Determination of niobium,tantalum,zirconium,hafnium and 15 rare earth elements content—Inductively coupled plasma mass spectrometry
Standard published on 9.3.2021
Selected format:Methods for chemical analysis of tungsten ores and molybdenum ores—Part 21:Determination of arsenic content—Hydride generation atomic fluorescence spectrometry
Standard published on 9.3.2021
Selected format:Latest update: 2026-06-14 (Number of items: 2 282 206)
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