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Standards GB - Chinese national standards - Page 5127
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 6730.42-2017
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Iron ores—Determination of lead content—Dithizone spectrophotometric method
Standard published on 7.9.2017
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GB/T 6730.42-2017E
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Iron ores—Determination of lead content—Dithizone spectrophotometric method
Standard published on 7.9.2017
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GB/T 6730.44-2017
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Iron ores—Determination of zinc content—1-(2-pyridylazo)-2-naphthol spectrophotometric method
Standard published on 7.9.2017
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GB/T 6730.44-2017E
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Iron ores—Determination of zinc content—1-(2-pyridylazo)-2-naphthoI spectrophotometric method
Standard published on 7.9.2017
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GB/T 6730.45-2025
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Iron ores—Determination of arsenic content—Arseno-molybdenum blue spectrophotometric method after hydrogen arsenide separation
Standard published on 30.6.2025
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GB/T 6730.46-2025
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Iron ores—Determination of arsenic content—Arseno-molybdenum blue spectrophotometric method after the distillation separation
Standard published on 29.8.2025
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GB/T 6730.47-2017
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Iron ores—Determination of niobium content—Sulfochlorophenol S spectrophotometric method
Standard published on 7.9.2017
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GB/T 6730.47-2017E
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Iron ores—Determination of niobium content—Sulfochlorophenol S spectrophotometric method
Standard published on 7.9.2017
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GB/T 6730.48-2021
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Iron ores—Determination of bismuth content— Dithiodiantipyryl methane spectrophotometric method
Standard published on 31.12.2021
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GB/T 6730.49-1986
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Methods for chemical analysis of iron ores The flame atomic absorbtion spectrophotometric method for the determination of sodium and potassium content
Standard published on 19.8.1986
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