Physico-chemical approach to study organotin sorption–desorption during solid-phase microextraction

Solid-phase microextraction (SPME) has become a real alternative to liquid–liquid extraction in the field of speciation of organometallic compounds. Despite the high performance of this preconcentration technique, matrix effects in natural samples can affect the analytical precision. In order to und...

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Bibliographic Details
Published in:Journal of Chromatography A 2003-05, Vol.999 (1), p.61-70
Main Authors: Aguerre, Sandrine, Lespes, Gaëtane, Potin-Gautier, Martine
Format: Article
Language:English
Subjects:
Agnatha. Pisces
Agronomy. Soil science and plant productions
Analytical chemistry
Animal, plant and microbial ecology
Applied ecology
Biological and medical sciences
Chemical Sciences
Chemical, physicochemical, biochemical and biological properties
Chemistry
Chromatographic methods and physical methods associated with chromatography
Ecotoxicology, biological effects of pollution
Effects of pollution and side effects of pesticides on vertebrates
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
Gas chromatographic methods
Humic substances
Humic Substances - analysis
Organic matter
Organotin compounds
Organotin Compounds - chemistry
Physics, chemistry, biochemistry and biology of agricultural and forest soils
Soil science
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Summary:Solid-phase microextraction (SPME) has become a real alternative to liquid–liquid extraction in the field of speciation of organometallic compounds. Despite the high performance of this preconcentration technique, matrix effects in natural samples can affect the analytical precision. In order to understand the origin of these disturbances and control the extraction step as best as possible, the sorption–desorption behaviour of organotins was studied. In the first part, this paper discusses the analytical problems encountered in the daily use of SPME due to the particular problems observed for phenyltins. The sorption profile of these compounds was modelled using experimental design methodology to confirm the first-order kinetics. Desorption of the compounds was also observed after a given time and could not be attributed to competition between organotin compounds. In the same way, butyl- and phenyltins were studied in the presence of humic substances, which acted as representatives of organic matter found in natural samples. These substances drastically decrease the extraction yields, but do not affect the sorption profile of butyl- and phenyltins.
ISSN:0021-9673
1873-3778
DOI:10.1016/S0021-9673(03)00329-7