Journal
TALANTA
Volume 131, Issue -, Pages 570-576Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2014.08.007
Keywords
Resonance Rayleigh scattering; Ethion; Silver nanoparticles
Categories
Funding
- Shahid Chamran University Research Council
- Environment Protection Agency (EPA) of Khosestan Province, Iran [1392]
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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 (Delta I-RRS) was linearly correlated to the concentration of ethion over the range of 10.0-900.0 mu g 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 mu g L-1, respectively. Relative standard deviations (RED) for 15.0 and 60.0 mu g 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. (C) 2014 Elsevier B.V. All rights reserved.
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