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首页> 外文期刊>Journal of mass spectrometry: JMS >Gas-phase copper and silver complexes with phosphorothioate and phosphorodithioate pesticides investigated using electrospray ionization mass spectrometry
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Gas-phase copper and silver complexes with phosphorothioate and phosphorodithioate pesticides investigated using electrospray ionization mass spectrometry

机译：使用电喷雾电离质谱法研究了硫代磷酸酯和二硫代磷酸酯农药的气相铜和银配合物

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摘要

Efforts to improve agricultural productivity have led to a growing dependency on organophosphorus pesticides. Phosphorothioate and phosphorodithioate pesticides are organophosphorus pesticide subclasses with widespread application for the control of insects feeding on vegetables and fruits. However, even low doses of these pesticides can cause neurological problems in humans; thus, their determination and monitoring in agricultural foodstuffs is important for human health. Phosphorothioate and phosphorodithioate pesticides may be poorly ionized during electrospray, adversely affecting limits of detection. These pesticides can form complexes with Cu2+ and Ag+, however, potentially improving ionization. In the present work, we used electrospray ionization/mass spectrometry (ESI/MS) to study fenitrothion, parathion, diazinon, and malathion coordination complexes with silver and copper ions. Stable1:1 and 1:2 metal/pesticide complexes were detected. Mass spectra acquired from pesticide solutions containing Ag+ or Cu2+ showed a significant increase in signal-to-background ratio over those acquired from solutions containing only the pesticides, with Ag+ improving detection more effectively than Cu2+. Addition of Ag+ to a pesticide solution improved the limit of detection by ten times. The relative affinity of each pesticide for Ag+ was related to complex stability, following the order diazinon>malathion>fenitrothion>parathion. The formation of Ag+-pesticide complexes can significantly improve the detection of phosphorothioate and phosphorodithioate pesticides using ESI/MS. The technique could potentially be used in reactive desorption electrospray ionization/mass spectrometry to detect phosphorothioate and phosphorodithioate pesticides on fruit and vegetable skins. Copyright (c) 2015 John Wiley & Sons, Ltd.
机译：提高农业生产率的努力导致对有机磷农药的依赖性越来越高。硫代磷酸酯和二硫代磷酸酯农药是有机磷农药的一类，广泛用于控制以蔬菜和水果为食的昆虫。然而，即使低剂量的这些农药也可能导致人类神经系统疾病。因此，它们在农业食品中的测定和监测对人类健康至关重要。硫代磷酸酯和二硫代磷酸酯农药在电喷雾过程中的离子化可能较差，对检测限产生不利影响。这些农药可以与Cu2 +和Ag +形成络合物，但是有可能改善电离作用。在当前的工作中，我们使用电喷雾电离/质谱（ESI / MS）研究了与银和铜离子结合的杀nitro磷，对硫磷，二嗪农和马拉硫磷配位化合物。检测到稳定的1：1和1：2金属/农药配合物。从含Ag +或Cu2 +的农药溶液中获取的质谱图显示，与从仅含农药的溶液中获得的质谱相比，信噪比有显着提高，其中Ag +比Cu2 +更有效地改善了检测。在农药溶液中添加Ag +可将检出限提高十倍。每种农药对Ag +的相对亲和力与复杂稳定性有关，其顺序为二嗪农>马拉硫磷>杀fe硫磷>对硫磷。 Ag +-农药复合物的形成可以显着改善使用ESI / MS进行硫代磷酸酯和二硫代磷酸酯农药的检测。该技术可潜在地用于反应脱附电喷雾电离/质谱法中，以检测水果和蔬菜皮上的硫代磷酸酯和二硫代磷酸酯农药。版权所有（c）2015 John Wiley＆Sons，Ltd.

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