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Crude ash by gravimetry
Crude ash of rice plant material is determined by gravimetry. An amount of the sample is weighed in a crucible and ignited at high temperature, 490 °C to remove organic matter. The remaining inorganic oxides are weighed as crude ash.
Note: To determine crude ash, the sample weight required is at least 4 g of plant sample.
Quality control methods for medicinal plant materials. 1st ed. (1998). World Health Organization (Geneva).
Animal feeding stuffs-- determination of crude ash. 2nd ed. ISO 5984.
Preparation of internal reference materials.