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Kinetics of the color change at various concentrations of Hg2+. a) UV–vis spectra of the colorimetric mercury sensor whilst 1.5 μM of Hg2+ is been added over the course of four minutes. A decrease in the absorbance at 700 nm and an increase at 520 nm is shown. b) The kinetics of the absorbance ratio increase as the Hg2+ concentration increases.
