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首页> 外文期刊>International Journal for Ion Mobility Spectrometry >Stir-bar sorptive extraction and TDS-IMS for the detection of pesticides in aqueous samples
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Stir-bar sorptive extraction and TDS-IMS for the detection of pesticides in aqueous samples

机译：搅拌棒吸附萃取和TDS-IMS用于检测水性样品中的农药

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In Ion Mobility Spectrometry (IMS), the analysis of aqueous samples is impaired by the mandatory removal of water. Before the sample enters the IMS system, the analyte must be extracted from water. For this purpose, the stir bar sorptive extraction (SBSE) method with polydimethylsiloxane (PDMS) as sorbent was chosen for the enrichment of alachlor, lindane and diuron from aqueous samples. Thermal desorption and detection of the analytes were carried out by conventional IMS coupled with an upstream thermal desorption system (TDS). K0-values were determined using optimized instrumental parameters e.g. gas flows, temperatures and shutter grid width. Furthermore, influence of the experimental parameters (e.g. pH, stirring time, sodium chloride) on enrichment degree of the analytes at the PDMS sorbent has been investigated. For calibration, non-linear second-order calibration functions were applied and the formulas for the Limit of Detection and Limit of Quantification were derived. For example, a Limit of Detection of 5 μg kg−1 and Limit of Quantification of 16 μg kg−1 were obtained for lindane.
机译：在离子迁移谱（IMS）中，强制去除水会损害水性样品的分析。在样品进入IMS系统之前，必须从水中提​​取分析物。为此，选择了以聚二甲基硅氧烷（PDMS）为吸附剂的搅拌棒吸附萃取（SBSE）方法，以从水性样品中富集甲草胺，林丹和杜伦。通过常规的IMS和上游的热脱附系统（TDS）进行热脱附和检测分析物。使用优化的仪器参数确定K0 值，例如气流，温度和百叶窗格栅宽度。此外，还研究了实验参数（例如pH值，搅拌时间，氯化钠）对PDMS吸附剂中分析物富集度的影响。对于校准，应用了非线性二阶校准函数，并得出了检测限和定量限的公式。例如，林丹的检出限为5μgkg-1 ，定量限为16μgkg-1 。

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