Sng M T, Lee F K, Lakso H A
Defence Science Organisation, Singapore.
J Chromatogr A. 1997 Jan 24;759(1-2):225-30. doi: 10.1016/s0021-9673(96)00727-3.
Frequent occurrences of pollution in natural drainage by industrial chemicals, especially pesticides, have triggered interest in the development of fast and unambiguous analytical techniques to verify these pollutants in order to facilitate rapid remedial actions. In this work, we report the development of a solid-phase microextraction (SPME) method to analyse two common industrial pesticides in water, i.e. malathion and parathion. SPME analysis facilitates direct analysis of chemical species in aqueous systems and avoids lengthy sample preparation procedures. In this study, we compare five commercially available fibres: 7 microns polydimethylsiloxane, 30 microns polydimethylsiloxane. 85 microns polyacrylate, 65 microns Carbowax-divinylbenzene and 65 microns polydimethylsiloxane-divinylbenzene fibres. Profiles of uptake by the fibres against adsorption times were established. The results obtained indicated that the polarity of the fibres is not the main factor affecting the uptake. The structures of the fibres also affected the permeation of the analytes onto the fibres. The limits of detection were determined to be in the low ppb level with a flame ionization detector. These methods have great potential for use in rapid on-site analytical work which is highly demanded in environmental studies.
工业化学品，尤其是农药，频繁污染自然排水系统，引发了人们对开发快速且明确的分析技术以检测这些污染物的兴趣，以便迅速采取补救措施。在这项工作中，我们报告了一种用于分析水中两种常见工业农药（即马拉硫磷和对硫磷）的固相微萃取（SPME）方法的开发。SPME分析有助于直接分析水体系中的化学物质，并避免冗长的样品制备程序。在本研究中，我们比较了五种市售纤维：7微米聚二甲基硅氧烷、30微米聚二甲基硅氧烷、85微米聚丙烯酸酯、65微米聚乙二醇-二乙烯基苯和65微米聚二甲基硅氧烷-二乙烯基苯纤维。建立了纤维对吸附时间的吸附曲线。所得结果表明，纤维的极性不是影响吸附的主要因素。纤维的结构也影响分析物向纤维上的渗透。使用火焰离子化检测器时，检测限确定为低ppb水平。这些方法在环境研究中急需的快速现场分析工作中具有巨大的应用潜力。
