Major objectives of this study are to evaluation the pollution and potential ecological risk of cadmium (Cd) in the sediments of Salt River estuary, Taiwan. Nine monitoring stations were installed near the estuary of Salt River to collect sediment samples for analyzing Cd. Results of laboratory analyses show that contents of Cd in the sediments are between 0.25 and 2.54 mg/kg with an average of 1.05±0.85 mg/kg. The spatial distribution of Cd reveals that the Cd concentration is relatively high near the river mouth, and gradually diminishes toward the harbor region. This indicates that upstream industrial and municipal wastewater discharges along the river bank are major sources of pollution. Results from the enrichment factor analysis imply that the sediments can be characterized as minor to severe degree of Cd enrichment. Results of geo-accumulation index analysis indicate that the sediments can be characterized as moderate degree of Cd accumulation. Results of potential ecological risk index indicate that the sediments at Salt River estuary has high to serious ecological potential risk.
Cheng-Di Dong, National Kaohsiung Marine University, Taiwan
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