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Received for review May 6,1986. Revised manuscript received September 8, 1986. Accepted March 13,1987. The work was supported by the Director, Office of Energy Research, Office of Health and Environmental Research, Human Health and Assessments Division of the US.Department of Energy, under Contract DE-AC03- 76SF00098.
Persistent Organic Chemicals in Sewage Effluents. 3. Determinations of Nonylphenoxy Carboxylic Acids by High-Resolution Gas Chromatography/Mass Spectrometry and High-Performance Liquid Chromatography Marljan Ahel,+ Thomas Conrad,$ and Walter Giger * 4 Swiss Federal Instltute for Water Resources and Water Pollution Control (EAWAG), CH-8600 Dubendorf, Switzerland,and Rudjer BoHkovie Institute, Center for Marine Research Zagreb, Y-4 1001 Zagreb, Yugoslavia
w (Nony1phenoxy)acetic acid (NPlEC) and [(nonylphenoxy)ethoxy]acetic acid (NPIEC) were determined in influents and effluents of mechanical-biological sewage treatment plants and in a polluted river. A characteristic set of isomers with differently branched nonyl substituents was identified by high-resolution gas chromatography/ mass spectrometry (HRGC/MS). Quantitative determinations with high-performance liquid chromatography (HPLC) and HRGC achieved relative standard deviations better than lo%, and detection limits were about 1pg/L. High concentrations of nonylphenoxy carboxylic acids were observed in secondary sewage effluents (71-330 pg/L), whereas nontreated sewage and primary effluents contained much lower levels (
