碩士 / 國立嘉義大學 / 水生生物科學系研究所 / 97 / The four sulfonamides – sulfadiazine (DIA), sulfadimethoxine (SDM), sulfamethoxazole (SMX) and sulfamethazine (SMZ) – are commonly used in aquaculture practices. The effect of light (dark and natural light), microbial activities (sterile, non-sterile, aerobic, anaerobic and readded treatment) and temperatures (10, 25 and 40°C) on the fate of sulfonamides in freshwater and marine water aquaculture pond waters and sediment slurries in a laboratory-scale experiment were investigated.
Results indicate that the four sulfonamides were all photodegradation in both the pond waters and sediment slurries. The ranges of the half-lives (t1/2) of the four SAs were 2.9 – 62.9 and 6.5 – 85.6 days in illuminated, sterile water and in the sediment slurry, respectively. But there were no significant degraded under dark condition. The degradation processes of the sulfonamides can also be enhanced by microbial activities in the light aside from the sole effect of light itself. The ranges of the t1/2 of the four SAs were 2.9 – 62.9 and 6.5 – 85.6 days in illuminated, sterile water and in the sediment slurry, respectively. The t1/2 values were slower in the non-sterile water and sediment slurry at 1.7 – 21.3 and 0.7 – 7.9 days, respectively. The synergetic effects of microbial activity on the degradation of DIA, SDM, and SMZ only occurred in the light and were hindered under dark conditions. Only SMX was slowly biodegradation in the dark. SDM and SMX were biodegraded in both freshwater and marine water pond sediment slurries during the anaerobic treatment, and degradation products were found. Further readded experiments showed the t1/2 of SDM in both freshwater and marine water pond sediment slurries and SMX in freshwater water pond sediment slurries were reduced by adapted microorganisms. After readding, the t1/2 values of SDM were reduced from 69.1 and 79.2 days to 22.0 and 20.6 days in freshwater and marine water pond sediment slurries, respectively. Then, t1/2 values of SMX were reduced from 8.9 to 7.0 in freshwater sediment slurries. Contrarily, t1/2 values of SMX in marine water pond sediment slurries were prolonged. In temperature experiments, the degradation of DIA and SMZ in marine water pond sediment slurries, SDM and SMX in the two kinds of sediment slurries were accelerated by interaction between temperature and microbial activities. The increased degradation of sulfonamides followed the increasing temperature, but there were no significant effect in sterile treatments.
| Identifer | oai:union.ndltd.org:TW/097NCYU5061003 |
| Date | January 2009 |
| Creators | Jung-Hsin Hou, 侯榮炘 |
| Contributors | Hong-Thih Lai, 賴弘智 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
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