碩士 / 國立交通大學 / 環境工程系所 / 93 / The work reported here was done to examine the effect of herbicides by using a close-system BOD bottle test and to assess the phytotoxicity on nontarget organisms such as algae（Pseudokirchneriella subcapitata）.
The toxic test was ended based on DO, final yield and growth rate methods. The cell density difference was used to calculate the final yield and growth rate.20 herbicides in 10 different chemical structure classes embracing 3 different modes of action according to Herbicide Resistance Action Committee were tested.
Experimental results indicated that the acute toxicity of the phytosynthesis-inhibiting Ⅱ herbicides were higher, but few of them were lower than those of the cell division inhibitor. However, the like auxenic-type herbicides are very weakly phytotoxic to algae, their acute toxicities were the lowest. When compare with other species, BOD bottle test shows a higher sensitivity than 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.
| Identifer | oai:union.ndltd.org:TW/093NCTU5515017 |
| Date | January 2005 |
| Creators | Su-Hua Hu, 胡素華 |
| 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 | 146 |
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