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J Environ Sci Health B ; 50(8): 584-9, 2015.
Article in English | MEDLINE | ID: mdl-26065518

ABSTRACT

The absorption of pesticide endosulfan on the surface of gold nanoparticles results from the formation of micrometric structures (1-10 µm) with irregular shape because of the aggregation of individual particles. Such aggregation of gold nanoparticles after absorption of pesticide shows a surface-enhanced Raman scattering (SERS) spectrum, whose intensity depends on the concentration of endosulfan. In addition, the discoloration of the colloidal solution and a diminishing of the intensity of the surface plasmon resonance absorption from individual particles were observed by UV-visible spectroscopy. At the same time, a second band between 638 and 700 nm confirms the formation of aggregates of gold nanoparticles as the concentration of endosulfan increases. Finally, we used the SERS intensity of the S-O stretching vibration at 1239 cm(-1) from the SO3 group as a measure of concentration of pesticide endosulfan. This method could be used to estimate the level of pollution in water by endosulfan in a simple and practical form.


Subject(s)
Endosulfan/chemistry , Gold/chemistry , Metal Nanoparticles/chemistry , Pesticides/chemistry , Adsorption , Colloids , Endosulfan/analysis , Spectrophotometry, Ultraviolet , Spectrum Analysis, Raman/methods , Surface Plasmon Resonance , Water/chemistry , Water Pollutants, Chemical/analysis , Water Pollutants, Chemical/chemistry
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