Use Method I unless otherwise directed.除另有规定外，采用方法一测定？方法一可是用的铂坩埚啊，如果批量多这得要多少铂坩埚？？
Method I (No Ph. Eur. method) Heat a platinum dish to redness for 10 minutes, allow to cool in a desiccator and weigh. Unless otherwise specified in the monograph, place 1 g of the substance being examined in the dish, moisten with sulphuric acid, ignite gently, again moisten with sulphuric acid and ignite at about 800°. Cool, weigh again, ignit e for 15 minutes and repeat this procedure until two successive weighings do not differ by more than 0.5 mg.
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