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A chemometric approach based on experimental design and desirability functions was used to develop and validate a SPME-GC-ICP-MS method for the determination of the organotin compounds dimethyltin, tributyltin and dibuthyltin. Three different SPME coatings were evaluated, obtaining the best results by using the divinylbenzene/carboxen/polydimethylsiloxane 2 cm 50/30 μm fibre. The optimal extraction conditions were found to be the following: T = 30 °C, t = 40 min and pH = 4. Method validation was performed by determining the most relevant quality parameters such as detection limit, quantitation limit, repeatability and intermediate precision. LOD values in the 0.2–8 ng L−1 were obtained.
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Bianchi et al. (2006) studied this question.
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