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首页> 外文期刊>Environmental Science & Technology >New Approach for the Analysis of Acidic Pesticides in Water by LC/MS with a Particle Beam Interface
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New Approach for the Analysis of Acidic Pesticides in Water by LC/MS with a Particle Beam Interface

机译：粒子束界面LC / MS分析水中酸性农药的新方法

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摘要

A new method for the determination of 18 acidic pesticides in water by liquid chromatography/mass spectrometry is presented. A liquid-solid extraction procedure for the isolation of the pesticides from the aqueous samples was employed. The method, which avails of a micro-flow rate particle beam interface, offers improved performance for the analysis of heat-sensitive compounds such as phenoxy acid herbicides. The new technique combines the benefits of a reduced mobile-phase flow rate (1-5 μL/min) with a modified vaporization surface inside the ion source of the mass spectrometer. The electron impact ion source was covered with a Teflon layer, which has been proven to minimize compounds' decomposition and adsorption. The improved vaporization of thermally unstable substances, accomplished by the modified surface, allows a higher signal response and an accurate reproduction of the original chromatographic profile. Electron impact ionization allows almost unambiguous identification of the analytes. The liquid chromatography, carried out with a C18 packed capillary column, was optimized to allow the injection of larger sample volumes, thus improving method sensitivity for trace level pollutants. The detection limits were in the range of 0.1-1 ppb, which is a considerable improvement in the analysis of these compounds with mass spectrometric detectors.
机译：提出了一种液相色谱/质谱法测定水中18种酸性农药的新方法。采用液-固萃取程序从含水样品中分离农药。该方法利用微流速粒子束界面，为分析热敏感化合物（例如苯氧基酸除草剂）提供了改进的性能。这项新技术结合了流动相流速降低（1-5μL/ min）和质谱仪离子源内部改良的蒸发表面的优点。电子碰撞离子源被特氟龙层覆盖，已被证明可以最大程度地减少化合物的分解和吸附。通过修饰的表面可以改善热不稳定物质的汽化，从而可以实现更高的信号响应和原始色谱图的准确再现。电子碰撞电离几乎可以明确地识别分析物。使用C18填充毛细管柱进行的液相色谱进行了优化，以允许进样量更大的样品，从而提高了方法对痕量污染物的灵敏度。检出限在0.1-1 ppb的范围内，这在用质谱检测器分析这些化合物方面有相当大的改进。

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