碩士 / 國立臺灣海洋大學 / 海洋環境化學與生態研究所 / 99 / To characterize the current contamination and seasonal variations of of organochlorine pesticides (OCPs) in the marine food chain in East China Sea (ECS), this study measured the concentrations of OCPs in surface planktons (＞ 200μm) in the ECS in spring and summer 2009. The total concentrations of OCPs in the planktons in spring and summer ranged from 0.7 to 121 ng g-1 (dry weight, dw) and from 11.2 to 1026 ng g-1 (dw), respectively. The predominant compounds of OCPs were heptachlor and endrin ketone in spring, and in summer were heptachlor and δ-BHC, respectively. Concentrations of OCPs in summer was higher than those in spring, and the elevated values were almost appeared in the inner shelf off China coastal area. The results suggested that OCPs are still being discharged, which were related to the OCPs residues derived from agricultural soils and current illegal use. Besides, this study used a simple atmospheric deposition equation to estimate OCPs flux into the surface layer of the ECS. The estimated fluxes of some OCPs were significantly lower than the observed results in the surface planktons. These results suggest the main sources of OCPs in the ECS may be related to the discharge from rivers and terrestrial inputs in China. These results confirm that OCPs persist in the ECS and their menaces can not be ignored. The usages and discharges of OCPs in countries near the ECS needed to be monitored and controlled.
| Identifer | oai:union.ndltd.org:TW/099NTOU5282027 |
| Date | January 2011 |
| Creators | Hsin-Lun Chiang, 江欣倫 |
| Contributors | Chin-Chang Hung, 洪慶章 |
| 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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