Abstract
The paper presents the results of the study on reduction of Cr2O72- to Cr3 + by aqueous solution of calcium polysulfide using spectrophotometric method. Concentrations of Cr (VI) were determined on the basis of the absorption spectrum at the wavelength range 350 - 372 nm. The change of the concentration of Cr (VI) during on reduction by calcium polysulfide has been shown. The influence of pH on the rate of reducing of Cr (VI) to Cr (III) was considered: the rate of reducing of hexavalent chromium decreases with increasing pH. The data obtained show that recycling Cr (VI) in industrial scale potentially effective at the pH = 5.
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