Determination of Chromium (III) and Chromium (VI) in Leather Leach Liquor by Ion Chromatography

This paper established the simultaneous determination of trivalent chromium and hexavalent chromium in leather extract by ion chromatographic analysis method. Using IonPac CS5A chromatographic column can finishing two valent chromiums analysis in 8 min. Trivalent chromium and hexavalent chromium were chelated respectively by PDCA and DPC, and were detected respectively in ultraviolet and visible wavelength by UV-Vis detector. The possible presence of dyes and organic pollutants in leather extract were pretreated by On Guard RP column. The detection limit of trivalent chromium and hexavalent chromium were 31.0 μg/L and 0.41 μg/L respectively. This method is of high sensitivity, low disturbance, hign accuracy and efficiency.