The objective of this study is to investigate the heavy metal pollution in our environment by sampling and analyzing the concentration of heavy metal in seawater, sediment, and aquatic organisms from the seaside along the Chang-hua Coastal Industrial Park. The Chang-hua Coastal Industrial Park, located by the west coast of Chung-hua county in middle Taiwan, is a large-scale and multi-functional industrial estate with industrial production, residence and leisure possibilities. Hsienhsi District is situated at the northern part of the Industrial Park. Lukang District is at the southern part. In the middle of it, it is Lunwei District. In the Chung-hua Coastal Industrial Park, there are the second most electroplate and metal coating factories in Taiwan. Metal waste from the process of electroplating and coasting could easily pollute the tidal flat in Chang-hua Coastal Industrial Park. In order to prevent potential pollution taking place, this study took seawater, segment, and the aquatic organisms from the coast of the Chung-hua Coastal Industrial Park to monitoring the concentration level of copper(Cu), zinc(Zn), nickel(Ni), lead(Pb), chromium(Cr) and cadmium(Cd) in each index.
The bioconcentration factor (BCF) indicates distinctions of accumulation in various matrixes. Especially from BCFW and BCFS demonstrate that soldier crab is a better index to illustrate the accumulation of Pb and Cr. Muricidae is a better index for showing Cd accumulating concentration. Furthermore, saccostreamordax is the best index for illustrating accumulative level of Ni. Oyster is better in showing accumulating of Cu and Zn. Though each organism shows distinct accumulation of particular metal, they can still illustrate the concentration of other selected metals to image the pollution of the environment.
The comparison of metal accumulating levels in seawater, segment, and aquatic organisms from each test site demonstrated: the heavy metal concentration at site2 was much higher than at the other sites. The second most heavy metal concentration was at site6 and site8. Matrixes at site4 contained the lowest heavy metal concentration. The result was thought to be caused by current capacities of factories in three districts of Chang-hua Coastal Industrial Park. Site2 was at Hsienhsi Districtin, in which contained about 58% of factories in residence. In Lukang District, it reached the highest-77%-where was site 6 and site 8. In terms of Site4, it situated at Lunwei District, where was Lunwei Harbor Reservation with least development following by least capacity of factories. Furthermore, without a sound environmental-protection biological sewage treatment device, residues and chemical waste produced from various highly contaminant industries would bring about this concentration comparison result as well.