This project was to (1) determine concentrations of 28 toxic substances in water, sediments and fishes of 10 rivers in Taiwan; (2) to apply the investigation results for policy-making of toxic substance management; and (3) to update the database of environmental distribution of toxic substances. There were 150 water, sediment and fish samples collected from 10 rivers (each river collected 6 water, 6 sediment and 3 fish samples) in this year. There were 2,610 analytical data obtained, including 360 data from water and 1,560 data from sediments and 690 data from fish samples. In water samples, the mean concentration and concentration range of analyzed toxic substances was <0.05 (ND-0.21) mg/L for formaldehyde, ND for carbontetrachloride, ND-<0.001 mg/L for chloroform, ND for 1,2-dichlorobenzene, <0.001 (ND-0.021) mg/L for chlorobenzene, <0.001 (ND-0.002) mg/L for 1,2-dichloroethylene. In sediment samples, the mean concentration and concentration range of analyzed toxic substances was <1.00 (ND-7.33) ug/kg ww for chloroform, <1.00 (ND-8.89) ug/kg ww for 1,2-dichlorobenzene, <1.00 (ND-19.9) ug/kg ww for chlorobenzene, ND-<1.00 ug/kg ww for 1,2-dichloroethylene, ND-<2.0 ug/kg dw for chlordane, 3.5 (ND-31.8) ug/kg dw for toxaphene, 0.150 (0.024-1.23) mg/kg dw for total mercury, ND-<0.05 mg/kg dw for Dimethyl phthalate (DMP), <0.05 (ND-0.07) mg/kg dw for Diethyl phthalate (DEP), 0.16 (<0.05-0.63) mg/kg dw for Dibutyl phthalate (DBP), 0.08 (<0.05-0.90) mg/kg dw for Butyl benzyl phthalate (BBP), 2.9 (0.12-29.2) mg/kg dw for Di(2-ethylhexyl)phthalate (DEHP), 0.06 (ND-1.3) mg/kg dw for Di-n-octyl phthalate (DNOP), ND-<0.05 mg/kg dw for Tributyltin (TBT), <0.05 (ND-0.79) mg/kg dw for Dibutyltin (DBT), <0.05 (ND-0.31) mg/kg dw for Butyltin (MBT), <0.05 (ND-0.42) mg/kg dw for Phenyltin (MPhT), <0.05 (ND-0.16) mg/kg dw for Diphenyltin (DPhT), <0.05 (ND-0.09) mg/kg dw for Triphenyltin (TPhT), 35.4 (0.508-952) ug/kg dw for total PBDEs, 210 (3.68-4,483) ug/kg dw for NP, 21.5 (<0.25-471) ug/kg dw for BPA, and 352 (ND-1,232) ug/kg ww for Arsenic (III). For fish samples, the mean concentration and concentration range of analyzed toxic substances was ND-<1.0 ug/kg ww for chlordane, 2.6 (ND-23.8) ug/kg ww for toxaphene, 0.049 (<0.01-0.172) mg/kg ww for total mercury, ND-<0.03 mg/kg ww for DMP, ND-<0.03 mg/kg ww for DEP, 0.05 (<0.03-0.19) mg/kg ww for DBP, 0.04 (<0.05-0.19) mg/kg ww for BBP, 0.25 (<0.03-1.2) mg/kg ww for DEHP, ND-<0.03 for DNOP, <0.01 (ND-0.03) mg/kg ww for TBT, <0.01 (ND-0.11) mg/kg ww for DBT, <0.01 (ND-0.03) mg/kg ww for MBT, <0.01 (ND-0.10) mg/kg ww for MPhT, <0.01 (ND-0.07) mg/kg ww for DPhT, <0.01 (ND-0.08) mg/kg ww for TPhT, and 1.74 (0.299-6.37) ug/kg ww for total PBDEs, 22.4 (ND-105) ug/kg ww for NP, and 0.844 (<0.625-8.01) ug/kg ww for BPA, <1.00 (ND-12.3) ug/kg ww for chlorobenzene, ND for 1,2-dichloroethylene. The database searching system for concentrations of regulated toxic substances has been updated with the investigation results in this year.

Toxic substances, Environmental distribution, River, Water, Sediment, Fish