Abstract
A rapid, sensitive and interference-free analytical procedure was applied to organotin speciation in sea water. The method was based on the ethylation of ionic organotin compounds in the aqueous phase with NaBEt4, followed by extraction of the derivatized species into hexane. The separation and determination of organotin species were performed by capillary Gas Chromatography-Microwave Induced Plasma-Atomic Emission Detection (GC-MIP-AED). The operational variables were ortimized for chromatographic resolution and detection limits. 100 mL of sample were used for the analysis and the detection limits, for butyltin species, were ranging from 17.7 to 33.4 ng/L (as Sn) and for phenyltin species, from 17.8 to 22.3 ng/L (as Sn). The method was applied to the determination of organotin species in samples collected from Thermaikos Gulf (Thessaloniki, Greece) at 4 sampling points and 3 sampling campaigns. The sampling points represented industrial, urban and harbour activities. In three samples collected during the second sampling campaign, and from three sampling points respectively, only dibutyltin species were present at concentration levels close to the detection limits.
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