ISO 4317:2011规定了使用卡尔·费歇尔试剂测定表面活性剂和洗涤剂含水量的两种滴定方法（容量法和库仑法）。 这些方法适用于粉末、糊状物和溶液形式的产品。 只有在每种产品的具体标准中有明确规定时，这些标准才适用。 由于碱性化合物与卡尔·费舍尔试剂反应，对于含有碱金属硅酸盐、碳酸盐、氢氧化物或硼酸盐的样品，这些方法给出的值太高。 因此，在测定水含量之前，需要分析样品中是否存在此类碱金属盐。

ISO 4317:2011 specifies two titration methods (volumetric and coulometric) using Karl Fischer reagent for the determination of the water content of surface active agents and detergents. These methods are applicable to products in the form of powders, pastes and solutions. They are applicable only if so indicated in the specific standard for each product. As alkaline compounds react with Karl Fischer reagent, the methods give values which are too high in the case of samples containing alkali metal silicates, carbonates, hydroxides or borates. Therefore, samples need to be analysed for the presence of such alkali metal salts prior to the determination of the water content.