碩士 / 國立臺灣海洋大學 / 環境生物與漁業科學學系 / 95 / Abstract
Heavy metals will not be decomposed in nature. After entering water environment, they will be absorbed by creatures and pollute more marine creatures by the bioaccumulation of the food chain. Shellfishes can protect themselves from damages caused by high concentration heavy metals to a less extent since they have particular protein. Therefore, usually, high concentration heavy metals can be detected in shellfishes. Oysters are excellent indicator organisms for monitoring marine pollution.
Before the Environmental Protection Administration (EPA) of Taiwan prohibited the application of the antifouling paint with tributyltin in 2005, high level of tributyltin (174-1510 ng/g dry wt.) had been detected in oysters along Hsiang-Shan offshore, Taiwan in years 1996-1997. Therefore, Hsiang-Shan offshore could be known as one of the areas that had been polluted with organotin earliest.
In the current research, the GC-FPD triple analysis result of the samplings of July, 2006 and January, 2007 showed the organotin compound level. The concentration of monobutyltin was ND-66 ng/g dry wt., dibutyltin 13-39 ng/g, and the most poisonous tributyltin 25-199 ng/g. As to the sediments, the concentration of monobutyltin was ND-16 ng/g dry wt., dibutyltin 12-26 ng/g, and tributyltin 9-27 ng/g.
Data of the concentration of dibutyltin and tributyltin in oysters there significantly revealed that the concentration of both of them at the northern and southern sampling sites of Hsiang-Shan offshore was higher than that at the middle. Supposedly, it was due to the topography. In respect of the sediments, all values were low as a result of the prevailing photolysis at the sampling point probably.
Data of this study showed that the concentration of monobutyltin and dibutyltin in oysters there in summer did not differ a lot from that in years 1996-1997. Nevertheless, the concentration of tributyltin was only about one fifth of that of ten years ago. In aspect of winter, the concentration of monobutyltin in oysters there still did not differ a lot from that in years 1996-1997, but the concentration of dibutyltin was about a quarter of that of ten years ago and the concentration of tributyltin was only about one eleventh. With those comparisons, it can be judged that the pollution of organotin in Hsiang-Shan has been controlled.
For food safety range, it is suggested that each person should not eat more than 924.88g wet wt. per day in summer and 286.18g in winter.
| Identifer | oai:union.ndltd.org:TW/095NTOU5451004 |
| Date | January 2007 |
| Creators | Chih-Hsiang Chang, 張志祥 |
| Contributors | Chun-Te Chen, 陳俊德 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 93 |
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