Abstract
Abstract Background Many analytical methods are available for detection of methyl parathion in water but they are not handy for on-site analysis. An attempt has been made to utilize stable GNP for methyl parathion detection by sensing the peak at 400 nm generated due to the interaction between methyl parathion and GNP. Methods GNP was produced by reduction of chloroauric acid solution by trichloroacetic acid in alkaline medium in presence of CTAB. Sensor properties of GNP were studied by varying the concentration of methyl parathion in gold sol from 0 to 500 ppm. Results and discussion GNP stabilized by CTAB showed only one peak at 532 nm and one broad peak near 300 nm was observed for pure methyl parathion. But as soon as methyl parathion was added in the GNP solution, one new peak at 400 nm developed in addition to the other two peaks. More interestingly, a quantitative decrease of the absorbance at 532 nm of GNP and increase of the absorbance at 400 nm, the new peak, were observed when methyl parathion concentration increased from 10 to 500 ppm. Conclusions The UV-VIS measurement and TEM images confirmed that the surfactant capped GNP can act as a colorimetric sensor for detection and estimation of methyl parathion pesticide present in water in ppm level.
Highlights
Many analytical methods are available for detection of methyl parathion in water but they are not handy for on-site analysis
The UV-VIS measurement and TEM images confirmed that the surfactant capped gold nanoparticles (GNP) can act as a colorimetric sensor for detection and estimation of methyl parathion pesticide present in water in ppm level
In the present work we have developed a method for preparation of gold nanoparticles (GNP) using trichloroacetic acid as reducing agent in alkaline medium in presence of surfactant which acts as capping agent
Summary
Optimization of GNP preparation GNP displays optical properties due to the presence of surface plasma resonance (SPR) band. The appearance of the new peak near 400 nm might be due to the bond formation between phosphorothioate group present in methyl parathion and the GNP. In presence of methyl parathion, the size, shape altogether changes drastically and a completely different look with an exciting feature is observed (Figure 3(B), 3(C) & 3(D)). It appears that restructuring of GNP occurs after addition of methyl parathion. We are interested to know what sort of interactions is taking place on the GNP surface with methyl parathion so that new peak develops at 400 nm To investigate this bonding XRD and FTIR have been employed. Nature of the bond which may be crucial for some applications of gold based nanoparticles for some other purposes
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