O. Fiehn, T. Reemtsma, M. Jekel
Sep 20, 1994
Citations
3
Influential Citations
54
Citations
Journal
Analytica Chimica Acta
Abstract
A method was developed for the analysis of benzothiazole, 2-mercaptobenzothiazole, 2_(methylthio)benzothiazole and 2-(thiocyanomethylthio)benzothiazole from industrial wastewater. It includes liquid-liquid extraction with ethyl acetate and toluene at pH 8.5, followed by liquid chromatographic (LC) analysis using a RP-18 column and an acetonitrile-water gradient with W detection at variable wavelengths. LC analysis is compared with the potential of gas chromatography and its advantages are discussed. Solid-phase extraction appeared not to be suitable for all compounds. The method allows the determination of benzothiazole derivatives without further clean-up down to contents of about 5 pg I-‘, with recovery rates exceeding 90% for all compounds. Dissolved organic carbon contents of up to 900 mg 1-l did neither interfere with extraction nor with chromatographic separation. Keywordr: Liquid chromatography; Extraction; Benzothiazoles; Wastewater; Waters 1. IJltroduction