Kinetics of oxidative decolorization of Amaranth red with acidic bromate
نویسندگان
چکیده
The kinetics of the oxidative decolorization of amaranth with KBrO3 acidified by H2SO4 was followed up by monitoring the decrease of the absorbance of amaranth at max = 520 nm. The reaction was carried out under pseudo-first-order conditions. The concentration of BrO3 was ca 300 greater than that of amaranth. The rate of reaction increased with increasing concentration of H2SO4 and BrO3, while amaranth had no effect on the rate of reaction. The effects of the ions, Cl, Br and SO4 were investigated and the reaction rate increased with increasing concentrations of chloride and bromide while it decreased with increasing concentration of SO4. A reaction mechanism has been proposed.
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