Tartaric acid extraction of organotin compounds from sediment samples |
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Authors: | Marcos Flores Manuel Bravo Paulette Maxwell |
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Affiliation: | a Departamento de Ciencias Básicas, Universidad Santo Tomas-Talca, Avenida Carlos Schorr 255, Talca, Chileb Laboratorio de Química Analítica y Ambiental, Instituto de Química, Pontificia Universidad Católica de Valparaíso, Avenida Brasil 2950 Valparaíso, Chilec Institute for National Measurement Standard, National Research Council Canada, Ottawa, Ontario, Canada K1A 0R6 |
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Abstract: | A new extraction method for the determination of tributyltin (TBT), dibutyltin (DBT) and monobutyltin (MBT) in sediments based on extraction with tartaric acid and methanol has been developed. Tin species were extracted from sediment samples using focused microwave technology, then ethylated with sodium tetraethylborate (NaBEt4) and analyzed by isotope dilution (ID) gas chromatography-mass spectrometry (GC-MS). The advantages of such methodology in comparison with other established extraction methods for the routine speciation analysis of organotin compounds are discussed with respect to sulfur interferences co-extracted from complex matrices.Interferences from elemental sulfur are normally found with acetic acid extraction, but with tartaric acid extraction these interferences were eliminated, demonstrating selective extraction.The accuracy of the analytical procedure was established by analyzing a certified reference material (CRM) (PACS-2, marine sediment) and comparing the results to the certified values. Good agreement between determined and certified values for butyltin compounds was obtained. Finally, some complex sediment samples collected from San Vicente's Bay, Chile, were analyzed with the proposed methodology, demonstrating its potential value for monitoring butyltins in environmental samples with high concentrations of sulfur compounds. |
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Keywords: | Focused microwave extraction Butyltin compounds Sulfur interferences Selective extraction Solid environmental samples |
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