Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
579291 | Journal of Hazardous Materials | 2011 | 9 Pages |
Abstract
This paper introduces a sequential eluent injection (SEI) technique combined with an on-line preconcentration/separation system for a fast and sensitive FAAS determination of trace amounts of Cr(III) and Cr(VI) species. The method is based on the simultaneous retention of Cr(III) and Cr(VI) on a single mini-column packed with a chloromethylated polystyrene functionalized with N,N-bis(naphthylideneimino)diethylenetriamine (PS-NAPdien) at pH 6.7. The retained chromium species was eluted by sequential injection of HCl for desorption of Cr(III), and NH3 and NH4NO3 buffer solutions for desorption of Cr(VI). All the chemical and flow injection variables were optimized for the quantitative preconcentration and speciation of Cr(III) and Cr(VI). Under the optimum conditions, the calibration graph obtained is linear over the concentration range of 2.0-60.0 μg Lâ1 for Cr(III), and 8.0-180.0 μg Lâ1 for Cr(VI). The preconcentration factors for Cr(III) and Cr(VI) were 70 and 30, respectively. The 3Ï detection limits were 0.6 μg Lâ1 and 2.5 μg Lâ1 for Cr(III) and Cr(VI), respectively. The relative standard deviations were 2.55% and 0.8%, respectively, for 6 replicate determinations of Cr(III) and Cr(VI) at the 40.0 μg Lâ1 level. The proposed method was applied for determination of Cr(III) and Cr(VI) in different water samples with satisfactory results.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Health and Safety
Authors
M. Arab Chamjangali, N. Goudarzi, M. Mirheidari, B. Bahramian,