Abstract
An analytical procedure for extraction of methyl- and butyltin compounds from eelgrass leaf tissue and their determination by a sensitive hydride generation-atomic absorption method is given. A 6 M HCl solution effectively extracts methyltin, and mono- and dibutyltin compounds, but tributyltin requires 2/1 (v/v) dichloromethane-methanol for efficient extraction. Hydride formation of all compounds by sodium borohydride in aqueous media is effective except for tributyltin which requires use of tetrabutylammonium borohydride in dichloromethane. Determinations of methyl- and butyltin compounds in eelgrass samples from the Great Bay Estuary (NH) demonstrate that, at the time of sampling (October, 1987), tributyltin pollution was minimal in this well-mixed estuarine system. Results from a mesocosm polluted with dibutyltin suggest that determination of butyltin compounds in seagrass tissue could be a sensitive means of detecting their presence in the aquatic environment, and could be used to monitor butyltin pollution.
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