Determination of fentin residues in potatoes and celery

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Abstract
An analytical procedure is described for the determination of residues of the fungicide fentin (triphenyltin acetate) from potatoes and celery. The method utilises a simple sample extraction procedure involving maceration with hexane followed by a methylation step using a Grignard reaction with methylmagnesium chloride. Samples are determined by packed-column gas chromatography with flame photometric detection. The limit of determination is 2 µg kg–1, which is well below the maximum concentration of fentin allowed in the substrates concerned (0.1 and 1 mg kg–1 for potatoes and celery, respectively). At spike levels of 0.1 mg kg–1, the recovery from potatoes was 84 ± 2%(n= 5); at 0.01 mg kg–1 this value was 82 ± 7%(n= 7). The blank value for potatoes, bought in a grocery store, was 2.8 µg kg–1.

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