Determination of butyltin, methyltin and tetraalkyltin in marine food products with gas chromatography-atomic absorption spectrometry.
Extraction methods were developed for the determination of butyltin, methyltin and tetraalkyltin in marine food products. Alkyltins were complexed with either diphenylthiocarbazone (dithizone) or tropolone from enzymatically hydrolysed samples. Tetraalkyltins were extracted with hexane. Butyl or methyl derivatives of the alkyltins were made by Grignard reaction for analysis by gas chromatography-atomic absorption spectrometry. Many of the examined marine food products contained ppb levels of alkyltins. Tetramethyltin and tetraethyltin levels were less than the method detection limits of 0.8 and 0.7 ng/g (as Sn), respectively.
Forsyth
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Food Research Division, Bureau of Chemical Safety, Food Directorate, Health Protection Branch, Health and Welfare Canada, Ottawa, Ontario K1A OL2, Canada.
Cleroux
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