Abstract
The complex equilibria of mercury(II) with Lawsone [2-hydroxy-1,4-naphthoquinone,LAS] were studied spectrophotometrically in 40% (ν/ν) ethanol water at 20°C and an ionic strength of 0.1M (NaClO4). A complete picture of the solution equilibria in thepH range 0.6–4.0 is presented. The complexation reactions were demonstrated and characterized using graphical logarithmic analysis of the absorbance graphs. A simple, rapid, selective, and sensitive method for the spectrophotometric determination of trace amounts of mercury is developed based on the formation of the orange-red Hg(LAS)2 complex atpH 2.7. The effect of interferences was studied. The method has been applied to the determination of traces of mercury in different matrices and some organomercury compounds.
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