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The Interaction Study of Thio-Organophosphate Pesticides with Colloidal Silver Nanoparticles for Colorimetric Sensing Applications

Rahimi, Sogol | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49267 (03)
  4. University: Sharif University of Technology
  5. Department: Chemistry
  6. Advisor(s): Hormozi-Nezhad, Mohammad Reza
  7. Abstract:
  8. Pesticides are broadly applied in croplands, glasshouses, and orchards in order to increase agricultural products and their quality. Among the variety of pesticides, organophosphorus pesticides (OPs), possessing high insecticidal activity, acute toxicity and relatively short environmental persistence, have been widely used for pest control in agriculture. However, this effect might lead to adverse health impacts or death for mammals and humans. Thus, even at trace levels, it is of great importance to develop a simple, sensitive, inexpensive and real-time detection method for monitoring the levels of pesticides in the environment, foodstuffs and biological samples. The integration of metallic nanoparticles (Au and Ag NPs) with UV-visible spectrometric technique can make this aim possible. In the present study, the interaction of a number of pesticides belonging to different groups, such as triazole, triazin, neonicotinoid, carbamate, organophosphate and thio-organophosphate, with two types of silver nanoparticles (AgNPs), citrate-capped and borohidryde-capped AgNPs has been investigated. After further studies on the interaction of thio-organophosphate members with AgNPs, we have developed a simple colorimetric assay based on the aggregation of AgNPs for the determination of phosalone in paddy water. The calibration curve for phosalone was derived from the absorption intensity ratio at 480 nm to the original wavelength (392 nm), from which a linear relationship in the concentration range of 0.08-0.8 ppm was revealed with a detection limit (3σ) of 0.06 ppm
  9. Keywords:
  10. Silver Nanoparticles ; Colorimetric ; Triazole ; Triazins ; Aggregation Method ; Organophosphorus Pesticide

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