期刊
ANALYTICA CHIMICA ACTA
卷 619, 期 1, 页码 59-66出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2008.02.013
关键词
hydroxyl-terminated polymethylphenylsiloxane polymethylphenylsiloxane-coated fiber; solid-phase microextraction; sol-gel; organochlorine; pyrethroid; gas chromatography-electron capture detector
An approach to the synthesis of hydroxyl-terminated polymethylphenylsiloxane (PMPS-OH) was proposed and the synthesized PMPS-OH was successfully applied as a precursor to prepare a novel coating for solid-phase microextraction (SPME) via the sol-gel process. The thickness and length of the prepared coating was 70 mu m and 1.5 cm, respectively. The extraction efficiency of the PMPS-coated fiber for selected pesticides was higher than that of commercial fibers including 100 mu m polydimethylsiloxane (PDMS), 85 mu m polyacrylate (PA) and 65 mu m polydimethylsiloxane/divinylbenzene (PDMS/DVB). The influence of the extraction process, extraction temperature, extraction time, stirring rate, ionic strength, GC inlet conditions, desorption temperature and time for PMPS-coated fiber application was studied and optimized. Several experiments were carried out to evaluate the analytical characteristics of the proposed SPME-GC-ECD method under optimized conditions. The linearity was from 0.5 to 100 ng g(-1) for p,p'-DDE, p,p'-DDD and bifenthrin, and from 2 to 100 ng g(-1) for o,p'-DDT, p,p'-DDT, fenpropathrin, beta-cyfluthrin and cyhalothrin. The detection limits of these pesticides were between 0.13 and 1.45 ng g(-1). The recovery of the pesticides spiked in various vegetables at 4 ng g(-1) ranged from 42.9% to 105.3%, and the relative standard deviations were less than 16.2%. (C) 2008 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据