Add time:08/02/2019         Source:sciencedirect.com

Bare silver nanoparticles were employed as a chemical sensor for selective detection of diazinon pesticide in fruit and vegetable samples. The sensing mechanism for detection of diazinon is based on the color change of AgNPs from yellow to pinkish-red followed by the red shift of LSPR absorption band in UV–Vis region after the addition of analyte in to the NPs solution. The color change and shift of LSPR band of AgNPs are observed only with diazinon molecule due to the π-conjugated pyrimidine nitrogen and sulfur moieties as well as specific orientation of diazinon molecule favored the non-covalent interactions with NPs. The control experiments with different pesticides and density functional theory (DFT) studies were also performed to validate the interactions between diazinon with AgNPs. Good linear range of 20–600 ng mL−1 with limit of detection of 7 ng mL−1 was obtained for determination of diazinon using AgNPs as a chemical sensor. Bare AgNPs was successfully exploited for quantitative determination of diazinon in fruit and vegetable samples (apple, grapes, beans and potato). The advantages of the present method are simple, rapid, selective as well as economic for the detection of pesticide in vegetable and fruit samples.

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