DIN EN ISO 8799-2010 表面活性剂.聚乙氧基醇硫酸盐和烷基酚硫酸盐.非硫酸盐物质含量的测定(ISO 8799-2009).德文版本EN ISO 8799-2009
Surface active agents - Sulfated ethoxylated alcohols and alkylphenols - Determination of content of unsulfated matter (ISO 8799:2009); German version EN ISO 8799:2009
This document specifies a method for the determination of the content of unsulfated matter present in ordinary commercial neutralized products of sulfation of ethoxylated alcohols or alkylphenols [alkyl oxyethylene sulfates (ethoxylated alcohol sulfates) or alkylphenol oxyethylene sulfates (ethoxylated alkyphenol sulfates)] containing an average of not more than 20 oxyethylene groups per molecule. The unsulfated matter is separated from a methanolic solution of the test portion on an ion-exchange column and is recovered from the eluate by evaporation and weighing of the residue.