Solid-phase extraction-liquid chromatography-fluorimetry for organotin speciation in natural waters |
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Authors: | E González-Toledo A Ortuño R Compañó M Granados M D Prat |
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Institution: | (1) Departament de Química Analítica, Universitat de Barcelona, Martí i Franquès, 1, 08028 Barcelona, Spain |
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Abstract: | Summary A method is reported for the determination of dibutyltin (DBT), diphenyltin (DPhT), tributyltin (TBT), and triphenyltin (TPhT)
species at the nanogram per litre concentration level in natural water samples. Analytes were isolated from samples by solid-phase
extraction and analysed both off-line and on-line by reversed-phase high-performance liquid chromatography with post-column
derivatization and fluorimetric detection. Several SPE cartridges and eluents were evaluated; C18 enrichment and elution with a mixture of methanol, acetic acid, and water was found most suitable. Preconcentration factors
up to 250 can be achieved when a 500-mL sample is processed. Detection limits, recovery rates, and the precision of the whole
process have been determined. The method has been applied to the determination of organotin species in spiked natural water
samples collected on the NW Mediterranean coast. Recovery rates range from 75 to 110% and detection limits are at the low
ng L−1 level (1–3 ng Sn L−1 for DPhT, DBT, and PhT and 40 ng Sn L−1 for TBT when 250 mL spiked sea water is processed.) |
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Keywords: | Column liquid chromatography Solid-phase extraction Water analysis Butyltin and phenyltin |
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