Abstract
The present study focusses on the spatial distribution and chemical speciation of organotin compounds in Alexandria coastal belt sediments. Surface sediments were collected by a Van Veen Grab, and analyzed by HDAAS for tributyl-, dibutyl-, monobutyl-, trimethyl-, dimethyl-, monomethyl-tins, and inorganic tin. The concentrations (as Sn) ranged from undetectable to 1200 ng g−1 dw (dry weight) for mono-methyltin (31 from 35 samples), undectable to 135 ng g−1 dw for dimethyltin (29 from 35 samples), undetectable to 80 ng g−1 dw for trimethyltin (6 from 35 samples), undetectable to 450 ng g−1 dw for monobutyltin (34 from 35 samples), undetectable to 425 ng g−1 dw for dibutyltin (29 from 35 samples) and 30 to 1375 ng g−1 dw for tributyltin (in allsamples). Methyl- and butyltin compounds are omnipresent in Alexandria coastal sediments. Methyltin compounds appear to form within the environment by debutylation of tributyltin, and butyltin compounds are derived from anthropogenic sources. No significant correlations were found between organic C (0.3 to 13.4%) and the alkyltin species concentrations.
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