Spectrophotometric Determination of Ametryn Herbicide in Drainage Water  Based on Aggregation of Gold Nanoparticles Capped with Citrate

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Rastgar, Mortaza | 2014

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 46372 (03)
University: Sharif University of Technology
Department: Chemistry
Advisor(s): Hormozi-Nezhad, Mohammad Reza; Torkian, A
Abstract:
Due to vast use of Ametryn herbicide in agricultural and even non-agricultural activities and the possibility of contamination of carp and natural water sources by this herbicide, determination of this herbicide in surface and ground water sources is very important. Therefor introducing simple and sensitive method for determination of Ametryn is critical.
This study demonstrate a simple and sensitive colorimetric method for the detection and determination of Ametryn based on aggregation of citrate capped AuNPs. Studied method relies upon shape and distance dependent AuNPs surface plasmon resonance. By replacing the sulfide containing Ametryn herbicide with citrate molecules on AuNPs surface, and as result of interactions between adsorbed Ametryn molecules and AuNPs aggregation, original plasmon resonance peak position at almost 520 nm red shift and new peak at long wavelengths at almost 650 nm intensifies which depend on pH, AuNPs and Ametryn concentration. The resulted calibration curve based on this property of AuNPs, display a linear relation in the range of 1/0 × 10-7– 6/6×10-6 M Ametryn. Lower limit of detection for Ametryn (3σ), was 9/7× 10-8 M
Keywords:
Gold Nanoparticle ; Spectrophotometric ; Ametryn Herbicide ; Drainage Water

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