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。 在硅酸盐存在下，将残余物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。 过滤最后的溶液，并在滤液或第一步的无硅酸盐溶液中用氯化钡沉淀硫酸盐。 将沉淀过滤、洗涤、在900摄氏度下加热并称重。 [外文原描述]： From a test portion all ethanol-soluble matter is removed by extraction with ethanol. In the presence of silicates the solution of the residue is treated with hydrochloric acid and evaporated to dryness. The residue is dissolved in water and the operations are repeated twice. The last solution is filtered and in the filtrate or in the silicatefree solution of the first step the sulfates are precipitated with barium chloride. The precipitate is filtered, washed, heated at 900 degree Celsius and weighed.
英文名称Surface active agents — Washing powders — Determination of inorganic sulfates — Gravimetric method