Analysis of nonylphenol polyethoxycarboxylates and their related metabolites by on-line derivatization and ion-trap gas chromatography-mass spectrometry.
This study presents a modified method to analyze nonylphenol polyethoxycarboxylates (NPEC) and their related metabolites (carboxyalkylphenol ethoxycarboxylates (CNPEC)) in water samples. The method involves extraction of samples by a graphitized carbon black (GCB) cartridge, and direct derivatization in the GC injection-port using a large-volume (10-20 microl) direct sample introduction (DSI) device with tetraalkylammonium (TAA) salts. The analytes are identified and quantitated by ion-trap GC-MS. The large-volume DSI injection-port derivatization technique provides sensitivity, fast and reproducible results for NPEC and their metabolites, to quantitation at 0.1 microg/l in 200 ml of water samples. The retention effect of TAA salts in the injection-port is not detected. In addition, the significant [M-29]+ ions and molecular ions of butylated NPEC and CNPEC residues are observed. Recovery of NP1EC in spiked water samples ranges from 90 to 108%. Moreover, relative standard deviations of replicate analyses ranges from 1 to 9%. However, unsatisfactory on-line derivatization of CNPEC residues is observed. This finding maybe owing to their lesser dissociation with the ion-pair reagent in chloroform.
Ding
W H
WH
Department of Chemistry, National Central University, Chnug-Li, Taiwan. wding@cc.ncu.edu.tw
Chen
C T
CT
D003902:Detergents / Q000032:analysis / Q000737:chemistry; D003998:Dicarboxylic Acids / Q000737:chemistry; D005026:Ethylene Glycols / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D010084:Oxidation-Reduction; D014867:Water / Q000737:chemistry
D003902:Detergents; D003998:Dicarboxylic Acids; D005026:Ethylene Glycols; D014867:Water; C021754:terics