Determination of Sodium Tolyltriazole and Sodium Mercaptobenzothiazole in Engine Coolants

摘要

A high performance liquid chromatography method was developed to quantitatively determine the corrosion inhibitors sodium tolyltriazole and sodium mercaptobenzothiazole in fresh and used ethylene glycol-based engine coolant formulations. Aliquots of coolant, diluted with water and methanol, are analyzed directly. Approximately one-half hour is required to determine both inhibitors with relative standard deviations of about 4.