On-line photodecomposition for the determination of antimony species

• Published in: Applied organometallic chemistry Vol. 20; no. 1; pp. 12 - 19
• Main Authors: Miravet, R., Bonilla, E., López-Sánchez, J. F., Rubio, R.
• Format: Journal Article
• Language: English
• Published: Chichester, UK John Wiley & Sons, Ltd 01.01.2006; Wiley
• Subjects: Analytical chemistry; Animal, plant and microbial ecology; antimony in plants; antimony photooxidation; Applied ecology; atomic fluorescence spectrometry; Biological and medical sciences; Chemistry; Chromatographic methods and physical methods associated with chromatography; Ecotoxicology, biological effects of pollution; Effects of pollution and side effects of pesticides on plants and fungi; Exact sciences and technology; Fundamental and applied biological sciences. Psychology; hydride generation; ion chromatography; Other chromatographic methods; speciation analysis; Terrestrial environment; Vegetals; Chemical analysis; hydride generation; Coupled method; antimony photooxidation; Antimony Compounds; Hydrides; Peroxodisulfates; Photochemical reaction; Operating conditions; speciation analysis; Ion chromatography; Ultraviolet radiation; Atomic fluorescence spectrometry; Medium effect; Antimony Organic compounds; Oxidation; antimony in plants; Photooxidation; Speciation
• ISSN: 0268-2605; 1099-0739
• DOI: 10.1002/aoc.1007

On‐line UV photooxidation by peroxodisulfate was coupled to ion chromatography hydride generation atomic fluorescence spectroscopy (IC‐UV‐HG‐AFS) for the speciation of inorganic antimony [Sb(III) and Sb(V)] and methylated species. Several parameters (UV lamp, irradiation time and peroxodisulfate concentration) that greatly influence the sensitivity of these three antimony species were investigated in depth. Under optimized conditions, photodecomposition resulted in an improvement in methylantimony species sensitivity. Dilution in di‐ammonium tartrate medium was necessary in order to ensure short‐term stability of Sb(III) at the µg l−1 concentration level. Furthermore, the efficiency of irradiation was strongly dependent on the chemical composition of the measured solution. Detection limits of 0.04 µg l−1 for Sb(V), 0.03 µg l−1 for Me3SbCl2 and 0.03 µg l−1 for Sb(III) as well as repeatability and reproducibility better than 4 and 8% RSD, respectively, were obtained. The proposed methodology was applied for antimony speciation in terrestrial plant sample extracts. Copyright © 2005 John Wiley & Sons, Ltd. On‐line UV photooxidation by peroxodisulfate was coupled to ion chromatography hydride generation atomic fluorescence spectrometry (IC‐UV‐HG‐AFS) for the speciation of antimony. Under optimised conditions, the photodecomposition resulted in an improvement in methylantimony species sensitivity.