Synthesis and determination of dicarboxylic degradation products of nonylphenol polyethoxylates by gas chromatography-mass spectrometry.
The synthesis and determination of persistent dicarboxylic metabolites of alkylphenol polyethoxylates (NPEOs), carboxyalkyl phenoxy ethoxy carboxylates (CAPECs), are investigated. The synthesized CAPECs have three and four carbon atoms and a carboxyl group in the alkyl chain side, and a carboxymethoxy acid group in its para-position (expressed as CA(3)P1EC and CA(4)P1EC in their abbreviation). The synthesis was successfully accomplished via a four-step reaction sequence that started from 4-fluoroanisole. After propylation by a propanol/acetyl chloride procedure, the derivatives of synthesized CA(3)P1EC and CA(4)P1EC were separated and identified by GC-MS with electron impact ionization (EI). The most abundant characteristic ions were produced by benzylic cleavages of carboxyalkyl chain to yield [M-87](+), corresponding to ions of m/z 235 for CA(3)P1EC and m/z 249 for CA(4)P1EC. Recoveries of synthesized CA(3)P1EC and CA(4)P1EC in various spiked water samples ranged from 82 to 92% with relative standard deviations (RSD) lesser than 7%. The limits of quantitation (LOQ) of CA(3)P1EC and CA(4)P1EC were estimated to be 0.005 and 0.01 microg/l in 100ml of water samples, respectively. The concentrations of CA(4)P1EC residues were detected in the aquatic environment ranging from n.d. to 3.24 microg/l. The results show that the synthesized CA(4)P1EC has been successfully applied to more accurately determine the concentrations of CA(4)P1EC residues in water samples.
Cheng
Chin-Yuan
CY
Department of Chemistry, National Central University, Chung-Li 32054, Taiwan.
Li
Wen-Ren
WR
Chang
Jenn-Woei
JW
Wu
Hsiao-Ching
HC
Ding
Wang-Hsien
WH
D003998:Dicarboxylic Acids / Q000032:analysis / Q000138:chemical synthesis*; D005026:Ethylene Glycols / Q000032:analysis / Q000138:chemical synthesis*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D011092:Polyethylene Glycols / Q000032:analysis / Q000138:chemical synthesis; D012680:Sensitivity and Specificity; D014874:Water Pollutants, Chemical / Q000032:analysis
D003998:Dicarboxylic Acids; D005026:Ethylene Glycols; D014874:Water Pollutants, Chemical; C021754:terics; D011092:Polyethylene Glycols