Extraction and analysis of various benzothiazoles from industrial wastewater

✍ Scribed by Oliver Fiehn; Thorsten Reemtsma; Martin Jekel

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 799 KB
• Volume: 295
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(94)80235-1

✦ Synopsis

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.