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7.11 WATER-SOLUBLE ASH

7.11 WATER-SOLUBLE ASH

         Boil the total ash for 5 minutes with 25 ml of water, collect the insoluble matter in a sintered-glass crucible or on an ashless filter paper, wash with hot water and ignite for 15 minutes at a temperature not exceeding 450º. Subtract the weight of the residue from the weight of the ash. The difference in weight is taken to be the water-soluble ash. Calculate the percentage of watersoluble ash with reference to the air-dried drug.

APPENDICES • 7.11 WATER-SOLUBLE ASH
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หมายเหตุ / Note : TP II 2011 PAGE 519