title: Isotope dilution GC-MS routine method for the determination of butyltin compounds in water.
abstract: A standard GC-MS instrument with electron impact ionisation has been used to develop a fast, simple and reliable method for the simultaneous determination of monobutyltin (MBT), dibutyltin (DBT) and tributyltin (TBT) in water samples. Isotope dilution analysis (IDA) is used for the determination of species, taking advantage of a commercially available spike solution containing a mixture of MBT, DBT and TBT enriched in 119Sn. Method detection limits for 100-mL samples were between 0.18 and 0.25 ng L(-1) for the three butyltin compounds with typical RSD between 2 and 4% at levels between 100 and 10 ng L(-1), respectively. Recovery of tin species in spiked samples (natural water, wastewater and seawater) was quantitative. The stability of butyltin compounds in collected seawater samples was also studied. The addition of a 1% (v/v) glacial acetic acid preserved tin species in the samples for at least 5 days at room temperature. The IDA method was finally implemented in a routine testing laboratory and it was subsequently accredited by the Spanish National Accreditation Body according to the requirements of UNE-EN ISO/IEC 17025.
authors.affiliation: Faculty of Chemistry, Department of Physical and Analytical Chemistry, University of Oviedo, Julián Clavería 8, 33006, Oviedo, Spain.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Centineo
authors.forename: Pablo
authors.initials: P
authors.lastname: Rodríguez-González
authors.forename: Elisa
authors.initials: E
authors.lastname: Blanco González
authors.forename: J Ignacio
authors.initials: JI
authors.lastname: García Alonso
authors.forename: Alfredo
authors.initials: A
authors.lastname: Sanz-Medel
authors.forename: Nuria
authors.initials: N
authors.lastname: Font Cardona
authors.forename: José Luis
authors.initials: JL
authors.lastname: Aranda Mares
authors.forename: Salomé
authors.initials: S
authors.lastname: Ballester Nebot