碩士 / 國立高雄海洋科技大學 / 海洋環境工程研究所 / 99 / Three sampling points (upstream Bakong Bridge, midstream Dehuei Bridge and downstream Xingzhong Bridge) are set at Hou-Jing River area from March to November 2010, in order to perform the sampling of water, sediment and Tilapia. Inductively coupled plasma atomic emission spectroscopy (ICP-OES) is used to perform heavy metal concentration analysis of Environmental Protection Bureau standard, including arsenic, lead, cadmium, chromium, copper, zinc and nickel, and a mercury analyzer is used to perform mercury concentration analysis.
The investigation result demonstrates: In Hou-Jing River water, the average concentration of five elements, including chromium, copper, nickel, lead and zinc, is highest at Dehuei Bridge. As for heavy metals in the sediment of Hou-Jing River, arsenic is not detected, but the average concentrations of the other metals are highest at midstream Dehuei Bridge. It might be related to the factory in the midstream area and semi-conductor production in the Nanzih Export Processing Zone, which causes the pollution to be injected into the water immediately. Heavy metal accumulates and deposits in the sediment of this river area, resulting in higher concentration.
The concentrations of heavy metal arsenic, chromium and lead in the water do not exceed the river water quality classification standard in Taiwan. The concentrations of cadmium, copper and mercury in part of the water exceed the standard, and the exceeding rates are: cadmium 44.4%, copper 72.2%, mercury 27.7%, and zinc 16.7%.
The concentration of heavy metal in sediment is mostly lower than the standard value of soil pollution and the food crop agricultural standard value. However, the maximum values of cadmium (21.4 mg/kg dry wt.), copper (557 mg/kg dry wt.) and zinc (2718 mg/kg dry wt.) in part of the sediments are higher than the standard value. The exceeding rates of cadmium and copper are 5.56%, and the exceeding rate of zinc is 22.2%.
The enrichment distribution of Hou-Jing River sediment heavy metal demonstrates that there is an enrichment phenomenon in total cadmium (EF=0~30.9), total copper(EF=1.69~6.08), total mercury (EF=0.673~1.71), total lead, (EF=4.15~5.95) and total zinc (EF=3.36~22.5) in the river area. Especially in the case of zinc, anthropogenic pollution is obvious.
As for the spatial distribution of heavy metal concentration in Hou-Jing River Tilapia, there is no obvious variation rule in heavy metal of each river area’s fish. This possibly results from the mobile nature of fish, so the feeding and growing environments are not stable, which causes this concentration distribution result.
The highest concentrations of cadmium and lead in Tilapia exceed the aquatic animal heath standard for about 2.2 times and 6.2 times, and the exceeding rates are 34.8% and 33.7%. There is no regulation for the other heavy metals. As for the Bioconcentration Factor (BCF) of heavy metal in Tilapia in Hou-Jing River, the maximum values of copper, nickel and zinc exceed regulation standards. Zinc levels especially exceed standards, at a maximum value is 8190 with the exceeding rate 25.7%.
There is obvious positive correlation between sediment and mercury and lead of Tilapia. The correlation between water and sediment achieves r > 0.96. There is also obvious positive correlation between water and Tilapia.
Based on the above results, there is certainly serious man-made pollution in Hou-Jing River. Government units should perform more active and serious action toward the pollution treatment and control of Hou-Jing River.
| Identifer | oai:union.ndltd.org:TW/099NKIMT282013 |
| Date | January 2011 |
| Creators | Huang, Hueiya, 黃慧雅 |
| Contributors | Lin, Chitsan, 林啟燦 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 92 |
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