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采用新型直接电子电离液相色谱/质谱联用接口测定水中痕量有机磷农药

Trace level determination of organophosphorus pesticides in water with the new direct-electron ionization LC/MS interface.

作者信息

Cappiello Achille, Famiglini Giorgio, Palma Pierangela, Mangani Filippo

机构信息

Istituto di Scienze Chimiche F Bruner, Università di Urbino, Italy.

出版信息

Anal Chem. 2002 Jul 15;74(14):3547-54. doi: 10.1021/ac015685f.

Abstract

A new LC/MS method for the determination of organophosphorus pesticides in water, based on the use of direct-electron ionization (EI) interface, is presented. Direct-EI is a new device that, in a very simple fashion, couples a nano-HPLC system with a mass spectrometer equipped with electron ionization capability. The nanoscale liquid flow allows for a direct introduction of eluate into the ion source and, after nebulization, for its ionization under typical EI conditions. Library-matchable EI spectra are generated for a choice of full scan or SIM detection of the analytes. In our case, a selection of organophosphorus pesticides, commonly distributed in local sugar beet cultivation, were considered. The new interface permits a very sensitive detection of the analytes in a wide range of linear response (0.09-9 ng). When applied to a real sample, the method allowed detecting four different pesticides at a concentration level of approximately 3 ng x L(-1).

摘要

本文介绍了一种基于直接电子电离(EI)接口测定水中有机磷农药的液相色谱/质谱新方法。直接EI是一种新型装置,它以非常简单的方式将纳米高效液相色谱系统与具备电子电离能力的质谱仪相连。纳米级液体流动使得洗脱液能够直接引入离子源,并在雾化后,在典型的EI条件下进行电离。通过对分析物进行全扫描或选择离子监测(SIM)检测,可生成可与谱库匹配的EI光谱。在我们的研究中,选取了当地甜菜种植中常见的几种有机磷农药进行研究。这种新型接口能够在很宽的线性响应范围(0.09 - 9 ng)内对分析物进行非常灵敏的检测。将该方法应用于实际样品时,能够检测出浓度约为3 ng x L(-1) 的四种不同农药。

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