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See Chinese contents: GB/T 23948-2009 GB/T 23948-2009: Inorganic chemical products method for the determination of water -insoluble matter
This Standard specifies the method summary, reagents and materials, instruments and apparatuses, analysis steps, and result calculation FOR inorganic chemicals for industrial use -- general method for the determination of water insoluble matter. This Standard applies to the determination of water insoluble matter content in inorganic chemical products. This Standard specifies the sand glass crucible method for the determination of non-alkaline water insoluble matter. When using this Standard to determine the water insoluble matter, the insoluble matter mass that is obtained by the calculation of sample size and specification value MUST not be less than 1 mg.
