Use of optional gas and collision cell for enhanced sensitivity of the organophosphorus pesticides by GC-ICP-MS
Use of optional gas and collision cell for enhanced sensitivity of the organophosphorus pesticides by GC-ICP-MS
复制标题
使用可选气体和碰撞池提高 GC-ICP-MS 对有机磷农药的灵敏度
DOI：
10.1039/b301704d
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发表时间：
2003
影响因子：
3.4
通讯作者：
J. Caruso
中科院分区：
文献类型：
--
作者：
A. Vonderheide;J. Meija;M. Montes;J. Caruso
有机磷农药作为杀虫剂、除草剂和杀菌剂广泛应用于农业和民用领域。这类化学品取代了20世纪70年代在美国被禁止使用的有机氯农药。在这项工作中，电感耦合等离子体质谱法（ICP-MS）探索作为一种选择，用于检测OP，监测磷存在于先前分离的化合物的GC。从历史上看，磷被认为是氩等离子体中难以分析的元素之一。这是由于其相对高的电离电位（10.5 eV）以及多原子干扰14 N16 O 1H+和15 N16 O+的固有存在，在m/z处与其唯一的同位素重叠
= 31。在这项工作中，使用市售的GC-ICP-MS接口，结合添加少量的可选气体，已被研究，以获得增强的灵敏度，它被发现，氮产量的灵敏度增加超过一个数量级。伴随着灵敏度的增加，由于在气相中形成的上述详细干扰，观察到背景增加。使用He作为碰撞气体，采用碰撞池来降低该背景而不影响分析物信号。仪器检测限在高ng L−1范围内的报告和开发的方法应用于分析自来水样品从城市的辛辛那提。
Organophosphorus pesticides (OP) are used widely in agricultural and residential applications as insecticides, herbicides and fungicides. This family of chemicals is one that replaced the organochlorine pesticides banned for use in the United States in the 1970s. In this work, inductively coupled plasma mass spectrometry (ICP-MS) is explored as an option for the detection of OPs, monitoring the phosphorus present in the compounds previously separated by GC. Historically, phosphorus has been recognized as one of the elements that is difficult to analyze in an argon plasma. This is due to its relatively high ionization potential (10.5 eV) as well as the inherent presence of the polyatomic interferences 14N16O1H+ and 15N16O+, overlapping its only isotope at m/z
= 31. In this work, the use of a commercially available GC-ICP-MS interface, in conjunction with the addition of small amounts of optional gases, has been investigated to obtain enhanced sensitivity and it is found that nitrogen yields an increase in sensitivity of over one order of magnitude. Accompanying this increase in sensitivity is an observed increase in the background due to the above detailed interferences formed in the gas phase. A collision cell is employed to reduce this background without affecting analyte signal using He as collision gas. Instrument detection limits in the high ng L−1 range are reported and the developed methodology is applied to the analysis of tap water samples from the City of Cincinnati.
影响因子：
7.4
作者：
Meija, J;Montes-Bayón, M;Caruso, JA
通讯作者：
Caruso, JA