碩士 / 中原大學 / 化學研究所 / 94 / The goals of this research is to investigate the extent of heavy metal pollution in an industrial park located at Tao-yuan County, Taiwan, and to study the possibility of using a common plant, torpedograss (Panicum repens L.), for phytoremediation of heavy metal pollution in Taiwan. Samples of water and sediment of a small river were collected, as well as the roots, stems, and leaves of torpedograss, and analyzed for the contents of nine heavy metals. The extraction of heavy metals from river sediment was treated with acid digestion method and Toxicity Characteristics Leaching Procedure (TCLP). Water samples were filtered and analyzed directly. The various parts of torpedograss were carbonized under high temperature and treated with concentrated nitric acid to extract the heavy metal ions. Flame atomic absorption spectrometry (FAAS) was utilized to measure the concentrations of copper, zinc, nickel, chromium, lead, cadmium, silver, manganese, and iron. Periodic validation of the calibration curve was performed to confirm the stability of the standard solution to be within ±10% of the actual value. Relative standard deviations (RSDs) of the interday and intraday analyses were all below 10%.
The research results showed that the river sediment was polluted with copper, zinc, chromium, and lead. The cumulative absorption abilities of the roots of torpedograss to copper, nickel, and lead were significant and the contents of zinc, chromium, manganese, and iron in the stems, leaves, and burl of torpedograss were more than those in roots. However, the absorption of silver by torpedograss was not significant. The relationship of the heavy metal contents between the torpedograss and the river sediment revealed that torpedograss had the best absorbency for chromium, and secondary for copper.
According to these preliminary results, we postulate that torpedograss may be a good candidate for treating soils and sediments that are polluted with chromium and copper.
| Identifer | oai:union.ndltd.org:TW/094CYCU5065045 |
| Date | January 2006 |
| Creators | Li-ling Yu, 游麗玲 |
| Contributors | Hwa-Kwang Yak, 葉華光 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 92 |
Page generated in 0.0078 seconds