title: Applicability of solid-phase microextraction combined with gas chromatography atomic emission detection (GC-MIP AED) for the determination of butyltin compounds in sediment samples.
abstract: The performance of solid-phase microextraction (SPME) applied to the determination of butyltin compounds in sediment samples is systematically evaluated. Matrix effects and influence of blank signals on the detection limits of the method are studied in detail. The interval of linear response is also evaluated in order to assess the applicability of the method to sediments polluted with butyltin compounds over a large range of concentrations. Advantages and drawbacks of including an SPME step, instead of the classic liquid-liquid extraction of the derivatized analytes, in the determination of butyltin compounds in sediment samples are considered in terms of achieved detection limits and experimental effort. Analytes were extracted from the samples by sonication using glacial acetic acid. An aliquot of the centrifuged extract was placed on a vial where compounds were ethylated and concentrated on a PDMS fiber using the headspace mode. Determinations were carried out using GC-MIP AED.
authors.affiliation: Departamento de Química Analítica, Nutrición y Bromatología, Instituto de Investigación y Análisis Alimentario, Universidad de Santiago de Compostela, Santiago de Compostela 15782, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Carpinteiro
authors.forename: I
authors.initials: I
authors.lastname: Rodríguez
authors.forename: R
authors.initials: R
authors.lastname: Cela
mesh_terms: D019342:Acetic Acid / Q000737:chemistry; D002849:Chromatography, Gas / Q000379:methods*; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D004129:Dimethylpolysiloxanes / Q000737:chemistry; D019015:Geologic Sediments / Q000032:analysis* / Q000737:chemistry; D013058:Mass Spectrometry / Q000379:methods*; D009757:Nylons / Q000737:chemistry; D009947:Organotin Compounds / Q000032:analysis*; D012680:Sensitivity and Specificity; D013010:Sonication
chemical_list: D004129:Dimethylpolysiloxanes; D009757:Nylons; D009947:Organotin Compounds; C085707:poly(dimethylsiloxane)-polyamide copolymer; D019342:Acetic Acid