Tributyltin distribution in the coastal environment of Peninsular Malaysia Original Research Article

The occurrence of tributyltin (TBT) is reported in the coastal waters of a few selected sites in Peninsular Malaysia. Water, bivalves and sediment samples collected were analysed specifically for TBT using sensitive analytical methods which involved a solvent extraction procedure with appropriate clean-up followed by graphite furnace atomic absorption spectrometric measurements. The levels of TBT in the seawater in unexposed areas were found in the range from <3.4 to 20 ng litre−1 as compared to coastal areas with high boat and ship activities where TBT levels in seawater were generally above 30 ng litre−1, with the highest level found at 281.8 ng litre−1. TBT levels in the tissues of random cockle and soft-shell clam samples from local markets were found in the range from <0.5 to 3.7 ng g−1 wet weight. The levels of TBT found in green mussel samples both from the market (23.5 ng g−1 wet weight) and those from a mussel farm (14.2 ng g−1 wet weight) indicate slight accumulation of TBT. In sediments, TBT levels were found ranging from <0.7 ng g−1 dry weight in unexposed coastal sites to as high as 216.5 ng g−1 dry weight for a site within a port area.