Chemistry Department, Faculty of Sciences, Shahid Chamran University, 6135714168 Ahvaz, Iran.
Chemistry Department, Faculty of Sciences, Shahid Chamran University, 6135714168 Ahvaz, Iran.
Talanta. 2015 Jan;131:570-6. doi: 10.1016/j.talanta.2014.08.007. Epub 2014 Aug 11.
A simple, novel and sensitive method was developed to determine ethion insecticide in water samples. This method was based on the interaction of ethion with silver nanoparticles (AgNPs) and quenching of the resonance Rayleigh scattering (RRS) intensity. The change in RRS intensity (ΔIRRS) was linearly correlated to the concentration of ethion over the range of 10.0-900.0 µg L(-1). Ethion can be measured in a short time (3 min) without any complicated or time-consuming sample pretreatment process. Parameters that affect the RRS intensities such as pH, concentration of AgNPs, standing time, electrolyte concentration, and coexisting substances were systematically investigated and optimized. Interference tests showed that the developed method has a very good selectivity and could be used conveniently for determination of ethion. The limit of detection (LOD) and limit of quantification (LOQ) were 3.7 and 11.0 µg L(-1), respectively. Relative standard deviations (RSD) for 15.0 and 60.0 µg L(-1) of ethion were 4.1 and 0.2, respectively. Possible mechanisms for the quenching of RRS of AgNPs were discussed and the method was successfully applied for the analysis of spiked real water samples.
一种简单、新颖且灵敏的方法被开发出来，用于测定水样中的乙硫磷杀虫剂。该方法基于乙硫磷与银纳米粒子（AgNPs）的相互作用以及共振瑞利散射（RRS）强度的猝灭。RRS 强度的变化（ΔIRRS）与乙硫磷的浓度在 10.0-900.0 µg L(-1) 范围内呈线性相关。乙硫磷可以在短时间（3 分钟）内进行测量，无需进行任何复杂或耗时的样品预处理过程。系统研究并优化了影响 RRS 强度的参数，如 pH 值、AgNPs 浓度、静置时间、电解质浓度和共存物质。干扰测试表明，所开发的方法具有很好的选择性，可方便地用于乙硫磷的测定。检测限（LOD）和定量限（LOQ）分别为 3.7 和 11.0 µg L(-1)。乙硫磷浓度为 15.0 和 60.0 µg L(-1) 时的相对标准偏差（RSD）分别为 4.1 和 0.2。讨论了 AgNPs 的 RRS 猝灭的可能机制，并成功将该方法应用于实际水样中添加的乙硫磷的分析。
