Improving detection limits for organotin compounds in several matrix water samples by derivatization-headspace-solid-phase microextraction and GC-MS

Triethyltin, tributyltin, diphenyltin and triphenyltin were selected as model compounds. The method is based on in situ ethylation and simultaneous headspace-solid-phase microextraction (HS-SPME) and gas chromatographic-mass spectrometry analysis (GC-MS) The extraction procedure was optimized studying some variables such as reaction time, salinity, sample volume and headspace volume SPME-GC-MS and SPME-GC-FID techniques were compared: quality assurance parameters such as sensitivity, selectivity and precision were established. The proposed procedure showed limits of detection between 0.025 and 1 ng/L The linearity was in the 0025-5000 ng/L range. The precision expressed as relative standard deviations (RSD), were below 20%. Real wastewaters and seawaters were analyzed The method permits controlling legislated annual average values. (C) 2009 Elsevier B.V. All rights reserved.