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Updated: Aug 13, 2026

Fabrication of a Dipole-assisted Solid Phase Extraction Microchip for Trace Metal Analysis in Water Samples
Published on: August 7, 2016
Physico-chemical approach to study organotin sorption-desorption during solid-phase microextraction
Sandrine Aguerre1, Gaëtane Lespes, Martine Potin-Gautier
1Laboratoire de Chimie Analytique Bio-Inorganique et Environnement, UMR 5034 CNRS, Université de Pau et des Pays de l'Adour, Avenue de l'Université, 64012 Pau Cedex, France. sandrine.aguerre@univ-pau.fr
Abstract:
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.
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