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- W2026024384 abstract "Persistent dicarboxylated metabolites of nonylphenol polyethoxylates (NPEOs), carboxyalkylphenoxy ethoxy carboxylates (CAPECs), have periodically been detected during gas chromatography/mass spectrometry (GC/MS) characterization of NPEO metabolites in samples of surface water and sewage effluent. An electron impact ionization (EI) MS study was conducted on two esterified CAPEC metabolites, CA4P1EC isomers (where A4 denotes a 4-carbonalkyl group plus one carboxylic group (C)). The most abundant characteristic ions were produced by benzylic cleavages to yield [M−87]+ and [M−101]+ ions, corresponding to ions of m/z 249 and 235, each of which is formed from one of two isomeric dipropyl esters CA4P1EC. These two base-peak ions were selected as precursor ions to help elucidate the fragmentation mechanisms and support the proposed structures via tandem mass spectrometric (MS/MS) experiments. The two isomers have been tentatively identified as 4-(2-ethyl-2-methylacetic acid)phenoxyacetic acid and 4-(3,3-dimethylpropionic acid)phenoxy acetic acid, which give rise to the fragments at m/z 249 and 235, respectively. Copyright © 2001 John Wiley & Sons, Ltd." @default.
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- W2026024384 date "2001-01-01" @default.
- W2026024384 modified "2023-09-27" @default.
- W2026024384 title "Structural elucidation of dicarboxylated metabolites of nonylphenol polyethoxylate surfactants in surface waters by gas chromatography/tandem mass spectrometry" @default.
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- W2026024384 doi "https://doi.org/10.1002/rcm.502" @default.
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