The study of trace metals of the aquaculture ponds in Taiwan Area
| Autor: | Jia-Huei Jeng, 鄭佳慧 |
|---|---|
| Rok vydání: | 2005 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 94 The trace metals accumulated in organisms in the aquaculture pond will be uptaken by human consumers through the food chain. As a result, the concentration of trace metals in aquaculture pond is one of the indicators that will affect the health of consumers. In this study, water samples from aquaculture ponds around the Taiwan were analyzed by the HACCP system. The concentration and distribution of dissolved Cd, Cu, Pb, and Zn in different kinds of aquaculture ponds were presented in this study. In addition, the distributions of particulate metals in the residual and non-residual phase of the some randomly selective aquaculture ponds were also shown. The results show that the concentration ranges of dissolved metals in aquaculture ponds are as follows: Cd, 0.001-1.211(average 0.02) m g/l; Cu, 0.029-13.369 (average 0.981) m g/l; Pb, 0.002-3.262 (average 0.131) mg/l; and Zn, 0.04-21.83 (average 1.30) mg/l, respectively. These concentrations completely follow the regulations of the Environmental Protection Administration (EPA) of Taiwan. The concentrations of dissolved metals slightly varied with different kind of aquaculture ponds. The average concentrations of Cd, Cu and Zn found in aquaculture ponds of the Pein-Tun area and Pb in aquaculture ponds in Yuin-Lin area are higher than those of other areas. In addition, the concentrations of Cd and Zn in Lutjanus argentimaculatus 、sedae, Cu in Rhabdosargus sarba and Pb in Tilapia zillii aquaculture ponds are higher than the other organisms in the different aquaculture ponds. In spite of that, The concentrations of particulate Cd, Cu and Pb are slightly dominant in the non-residual phase, accounting for 54-67% of total concentration. While, the concentration of particulate Zn is chiefly dominant in the residual phase, occupying more than 84% of total concentration. Finally, in order to avoid the over accumulation of trace metals in human consumers through the aquaculture organisms, it is necessary to monitor the concentrations of chemical constituents, especially trace metals and pesticides, in aquaculture ponds. This can prevent from the toxicity of trace metals caused by aquaculture foods in consumer. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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