碩士 / 國立交通大學 / 環境工程系所 / 92 / The purpose of this research is to compare the results of seven pesticides on freshwater aquatic toxicity tests, and evaluate the joint action of these toxicants with each other. This research has present that the sensitivity of standard algal toxicity test (Batch tests) on pesticides, especially on volatile organic compound is less receptive than other toxicity test method, such as algae, fish or water fleas toxicity test. Furthermore, this experience reveals that by using a closed-system on algal toxicity test can enhance the sensitivity on testing volatile pesticides, and prove the default on Batch tests. In addition, a cut-off value approach is proposed to determine whether NOEC or EC10 should be chosen for estimating low toxic effects. The results indicate that NOEC offers better protection to test organisms than EC10.
Another interesting finding is that the joint toxicity of complex mixtures. There are 15 sets of tests. There are about 46.7﹪on synergistic joint actions were identified. Then, other combined effects were additive or antagonistic. As the information, the synergism is significantly presented, which is similar actions on the literature data. There is consideration that tests using different endpoints or different mixture contents might result in diverse responses. It is speculated of the reason in the biochemical action of pesticides to organism, and worthy of discussion in the future.
| Identifer | oai:union.ndltd.org:TW/092NCTU5515008 |
| Date | January 2004 |
| Creators | Huei-Jiun Yeh, 葉徽君 |
| Contributors | Chung-Yuan Chen, 陳重元 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 102 |
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