Analysis of linear alkylbenzenesulfonates in water samples by large-volume injection-port derivatization and gas chromatography-mass spectrometry

被引:35
作者
Ding, WH [1 ]
Chen, CT [1 ]
机构
[1] Natl Cent Univ, Dept Chem, Chungli 32054, Taiwan
关键词
water analysis; environmental analysis; derivatization; GC; large-volume injection; alkylbenzenesulfonates; surfactants;
D O I
10.1016/S0021-9673(99)00722-0
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
This work presents a modified method to analyze linear alkylbenzenesulfonates (LASs) 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 mu l) direct sample introduction (DSI) device with tetraalkylammonium (TAA) salts. The analytes were then identified and quantitated by ion-trap GC-MS. The large-volume DSI injection-port derivatization technique provides sensitivity, fast and reproducible results for LAS residues, to quantitation at 0.1 mu g/l in 200 mi of water samples. The retention effect of TAA salts in the injection port was not detected. Enhanced selected mass chromatograms of [M-55](+) ions of butylated C-10-C-13 LASs by electron impact ionization MS allows one to determine LAS residues at trace levels in environmental samples. Recovery of total LASs in spiked variety water samples ranged from 89 to 112% while RSDs ranged from 2 to 13%. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:359 / 364
页数:6
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