Improved analytical performance of photoionization ion mobility spectrometry for the rapid detection of organophosphorus pesticides using K-0 patterns with multiple reactant ions

文献类型： 外文期刊

第一作者： Zhou, Qinghua

作者： Zhou, Qinghua;Wang, Bin;Jin, Zanhui;Chen, Jinyuan;Li, Jia;Li, Haiyang

作者机构：

期刊名称：RSC ADVANCES （ 影响因子：3.361； 五年影响因子：3.39 ）

ISSN： 2046-2069

年卷期： 2018 年 8 卷 32 期

页码：

收录情况： SCI

摘要： Ion mobility spectrometry (IMS) has become a potential technique for the rapid detection of organophosphorus pesticides (OPPs). However, using only the commonly-used reactant ion (Ac)(2)H+(H2O)(n), some OPPs are difficult to distinguish due to their severely overlapping ion peaks. In this study, the switching of reactant ions ((Ac)(2)H+(H2O)(n), O-2(-)(H2O)(n) and Cl-(H2O)(n)) in a stand-alone photoionization ion mobility spectrometer was realized by on-line switching the polarity of high voltage and dopant species. Multiple reactant ions were employed to establish the characteristic K-0 patterns for the tested OPPs, including fenthion, dursban, dimethoate, malathion, fenitrothion, imidan and isocarbophos. The tested OPPs were represented on a heat map and a three-dimensional coordinate system based on the K-0 patterns, from which they could be readily identified. Under optimal conditions, the limits of detection (LODs) of the tested OPPs were evaluated to be 0.3-2.7 ng, and satisfactory repeatability was demonstrated by the obtained relative standard deviations (RSDs) of 4.8% to 14.7%. Finally, Chinese cabbage extract spiked with dursban and malathion was detected by the proposed ion mobility spectrometer, demonstrating its applicability for the simultaneous identification of coexisting OPPs in real samples.

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