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See Chinese contents: GB/T 11275-2007 GB/T 11275-2007: Surface active agents -- Determination of water content
This Standard specifies the method for the determination of the water content of surface active agents. Xylene azeotropic distillation can be used for powdery, slurry and liquid products with water content (mass fraction) greater than 5%. However, the azeotropic distillation method is not suitable for products containing water-soluble volatiles, such as products containing ethanol. The Karl Fischer method is the only applicable method for powdery, slurry and liquid products with water content (mass fraction) less than 1%. However, the specimen contains basic compounds such as silicate, carbonate, hydroxide and borate, which will affect the measured value, so the basic compounds in the specimen should be analyzed before measurement.
