Determination of butyltins and phenyltins in oysters and fishes from Taiwan coastal waters

Along the western coast of Taiwan, high concentrations of butyltin compounds (BTCs), such as tributyl- (TBT), dibutyl- (DBT) and monobutyl- (MBT) (91–1658 ng/g, dry wt) with relatively high percentages (85–100%) were found in oysters ( Crassostrea gigas) collected in winter compared with those concentrations (99–763 ng/g) with relatively low percentages (as low as 23%) in summer. However, in contrast to BTCs, higher contents (102–590 ng/g) with low percentages (as high as 77%) of phenyltins (PTCs), such as triphenyl- (TPT), diphenyl- (DPT) and monophenyl- (MPT), were found in summer compared with those values (nd–147 ng/g) with low percentage (0–15%) in winter. For the fish ( Pahrus major, Cephalopholis argus, Lates calacriter, Scarus cedema) samples, collected near Kaohsiung offshore area, the contents (dry wt) of MPT (