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Standards GB - Chinese national standards - Page 8665
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 7880-1987
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Determination of available zinc in forest soil
WITHDRAWN published on 1.1.1987
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GB 7881-1987
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Determination of available iron in forest soil
WITHDRAWN published on 1.1.1987
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GB 7882-1987
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Determination of exchangeable manganese in forest soil
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GB 7883-1987
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Determination of easy reducible manganese in forest soil
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GB 7884-1987
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Preparation of forest plant and forest floor samples
WITHDRAWN published on 1.1.1987
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GB 7885-1987
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Determination of crude ash content in forest plant and forest floor
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GB 7886-1987
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Determination of total nitrogen in forest plant and forest floor (kjeldahl method)
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GB 7887-1987
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Determination of total silica, total iron, total aluminium, total calcium, total magnesium, total potassium, total sodium, total phosphorus, total sulphur, total manganese, total copper, total zinc in forest plant and fores
WITHDRAWN published on 1.1.1987
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GB 7888-1987
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Determination of total nitrogen, total phosphorus, total potassium, total sodium, total calcium, total magnesium in forest plant and forest floor (method for wet digestion with sulphuric and perchloric acid)
WITHDRAWN published on 1.1.1987
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GB 7889-1987
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Determination of total chlorine in forest plant and forest floor
WITHDRAWN published on 1.1.1987
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