Indicator Tubes for Sorption-Sectroscopic and Test-Determination of Cr(VI) in Waters

An indicator tube was proposed based on cation exchanger KU-2-8 for sorption-spectroscopic and visual-colorimetric determination of Cr(VI) in waters of different categories. Geometric parameters of the indicator tube were optimized and was found that linearity of the graduation graph for sorption-spectroscopic determination of Cr(VI) is observed within the interval of concentrations 0.01–0.40 μg/cm 3 at the weighted amount of the cation–exchanger KU-2-8 0.5 g and the diameter of the column 10 mm. It is shown that the greatest contribution to the resultant color is made by the function of complete color difference, while developed colorimetric scales made it possible to assess the content of Cr(IV) in waters at the MAC level.