Figure 3.

UV–vis spectra of GNP and with methyl parathion, calibration curve (absorbance versus methyl parathion), and control spectrum. (A) UV–vis spectra of GNP and GNP with various concentrations of methyl parathion 10 to 200 ppm; (inset) digital photographic images of color changes due to addition of methyl parathion. (B) Calibration curve between absorbance of 400-nm peak versus concentration of methyl parathion. (C) Spectrum of pure methyl parathion (control experiment).

Barman et al. Nanoscale Research Letters 2013 8:181   doi:10.1186/1556-276X-8-181
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