Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10559046 | Spectrochimica Acta Part B: Atomic Spectroscopy | 2005 | 5 Pages |
Abstract
A method for the preconcentration and speciation of chromium was developed. On-line preconcentration and determination were obtained using inductively coupled plasma optical emission spectrometry (ICP-OES) coupled with flow injection. To determinate the chromium (III) present in parenteral solutions, chromium was retained on activated carbon at pH 5.0. On the other hand, a step of reduction was necessary in order to determine total chromium content. The Cr(VI) concentration was then determined by difference between the total chromium concentration and that of Cr(III). A sensitivity enrichment factor of 70-fold was obtained with respect to the chromium determination by ICP-OES without preconcentration. The detection limit for the preconcentration of 25 ml of sample was 29 ng lâ1. The precision for the 10 replicate determinations at the 5 μg lâ1 Cr level was 2.3% relative standard deviation, calculated with the peak heights. The calibration graph using the preconcentration method for chromium species was linear with a correlation coefficient of 0.9995 at levels near the detection limits up to at least 60 μg lâ1. The method can be applied to the determination and speciation of chromium in parenteral solutions.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
R.A. Gil, S. Cerutti, J.A. Gásquez, R.A. Olsina, L.D. Martinez,