碩士 / 國立臺灣海洋大學 / 海洋環境資訊系 / 106 / The estuarine water samples were collected from the Danshuei River Estuary and its tributary, the Keelung River, in July and December of 2017, and April of 2018. In addition, the surface sediment samples were also collected in April, 2018. The water samples were analyzed for the dissolved and particulate concentration of As and Se, and their partitioning between these both phases were also discussed. In addition, the pre-concentration of dissolved Se was also studied by the extraction method of APDC/Freon. The better extraction pH value was at ca. 5.5 and the extraction efficiency was not influenced by the salinity factor. The dissolved As concentration of the estuarine water samples ranged within 0.32-3.28μg/L and had a good positive/negative correlation with salinity, depending on the riverine As concentration. The dissolved Se concentration of the estuarine water samples ranged within <0.006-3.50μg/L and the concentration obtained in December survey was higher than that of the July and April surveys. The particulate As and Se concentrations of the estuarine water samples ranged within ND-57.97mg/kg and ND -43.67 mg/kg, respectively, and higher concentration appeared at the Keelung River region. The As and Se concentrations in the sediment samples ranged within 5.52-23.55 mg/kg and 0.034-2.831 mg/kg, respectively, and higher concentration generally located at the middle and the lower estuary. The leachable concentrations of As and Se in the sediment samples accounted for 28-53% and <30% of the their total concentrations, suggesting that As was more labile and Se was inert in the sediment. The partitioning log values of As and Se in the dissolved and particulate phases ranged within 3.2-4.8 and 2.7-5.1, respectively, and the both values were independent with salinity. Finally, the total concentrations of both elements in the water samples were mainly present in the dissolved phase rather than the particulate phase.
| Identifer | oai:union.ndltd.org:TW/106NTOU5276013 |
| Date | January 2018 |
| Creators | Liu, Yi-Jia, 劉怡佳 |
| Contributors | Fang, Tien-Hsi, 方天熹 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 49 |
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