标准摘要
[中文适用范围]： 通过用乙醇萃取从测试部分中除去所有乙醇可溶性物质。 将不溶于乙醇的残余物的溶液用盐酸处理并蒸发至干。 将残余物溶解在水中并重复该操作两次。 从该操作后获得的溶液中过滤沉淀物，洗涤，加热至900℃并称重。 [外文原描述]： From a test portion all ethanol-soluble matter is removed by extraction with ethanol. The solution of the ethanol-insoluble residue is treated with hydrochloric acid and evaporated to dryness. The residue is dissolved in water and the operations are repeated twice. From the solution obtained after this operations the precipitate is filtered, washed, heated to 900 °C and weighed.
英文名称Surface active agents — Washing powders — Determination of total silica content — Gravimetric method