Cationic surfactants based disinfectants have been widely used in practice for over 20 years. Despite the significant advances in analytical chemistry during this period, the determination of mixtures of several quaternary ammonium compounds in one disinfectant still causes certain difficulties. This work describes the separation in the combined presence of alkyldimethylbenzylammonium chloride, alkyldimethyl (ethylbenzyl) ammonium chloride, and dimethyldioctylammonium chloride in disinfectants using high performance liquid chromatography with a charged aerosol detector. The method was tested on model solutions and real disinfectants. The linearity range for alkyldimethylbenzylammonium chloride was from 0.03 to 0.17 %, for alkyldimethyl (ethylbenzyl) ammonium chloride – from 0.03 to 0.15 %, and from 0.01 to 0.11 % for dimethyldioctylammonium chloride. The calculated relative error of the method did not exceed 9 %. Thus, the proposed method can be used to analyze preparative forms of disinfectants containing these and other cationic surfactants.
Comparison of dairy phospholipid preparative extraction protocols in combination with analysis by high performance liquid chromatography coupled to a charged aerosol detector
