2010 Volume 83 Issue 1 Pages 9-12
A simple, fast and selective method for determination of chromium (VI) in ink of chromium (III) complex dye is described. The proposed method is based on anion-exchange solid-phase extraction, in which chromium (VI) was separated after shaking for 1 min from the mixture of MIBK of the ink and a 20 mL of 0.1 and 8M nitric acid at room temperature. Under the optimized experimental conditions, chromium (VI) of black and red ink samples was determined by ICP-AES, and the recoveries for chromium (VI) were 104 and 107%, respectively. This method is applicable to extract only chromium (VI) from chromium (III) matrix such as chromium complex dye.