This International Standard specifies methods of analysis of technical sodium alkylarylsulphonates. lt covers the following determinations : - Measurement of pH. - Determination of water cor - Determination of free alkal - Determination of matter roleum. - Determination of sodium tent. itent. inity or free acidity. extractable by light petalkylarylsulphonates con- - Determination of sodium sulphite content. - Determination of sodium sulphate content. - Determination of sodium chloride content. lt also sets out, in annexes A : a general scheme of analysis; B : a rapid method for the determination of sodium alkylarylsulphonates.