ISO 893:1989

Specifies the following methods of analysis for the substance to be tested: measurement of pH, determination of water content, determination of free alkalinity or free acidity, determination of matter extractable by light petroleum, determination of sodium alkane sulphonates content, determination of alkane monosulphonates content, determination of sodium sulphite content, determination of sodium sulphate content, determination of sodium chloride content. In annexes a general scheme of analysis and a method for the determination of total salts content is given.