Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10560177 | Talanta | 2011 | 6 Pages |
Abstract
HG-AFS is highly sensitive and low cost detection system and its use for antimony chemical speciation coupled to HPLC is gaining popularity. However speciation analysis in soils is strongly hampered because the most efficient extractant reported in the literature (oxalic acid) strongly inhibits the generation of SbH3 by Sb(V), the major species in this kind of matrix, severely affecting its detection limits. The purpose of this research is to reduce the detection limit of Sb(V), by using a post column on-line reduction system with l-cysteine reagent (HPLC/pre-reduction/HG-AFS). The system was optimized by experimental design, optimum conditions found were 2% (w/v) and 10 °C temperature coil. Detection limits of Sb(V) and Sb(III) in oxalic acid (0.25 mol Lâ1) were improved from 0.3 and 0.1 μg Lâ1 to 0.07 and 0.07 μg Lâ1, respectively. The methodology developed was applied to Chilean soils, where Sb(V) was the predominant species.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Waldo Quiroz, David Olivares, Manuel Bravo, Jorg Feldmann, Andrea Raab,