Potential plant species as fluoride hyperaccumulators | |
| Author | Sawitree Sasirat |
| Call Number | AIT Thesis no.EV-07-44 |
| Subject(s) | Fluorides--Environmental aspects Phytoremediation |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Environmental Engineering and Management |
| Publisher | Asian Institute of Technology |
| Abstract | Phytoremediation has shown great potential as a sound environmental technology to remediate contaminated soil and groundwater. Fluoride contamination in groundwater has become a problem especially in the north part of Thailand. A searching for fluoride hyperraccumulators is an important process for applying phytoremediation in endemic fluoride contamination. The objective of this research was to investigate the capability of four plant species for fluoride uptake and deposition in plants from half strength of Hoagland nutrient solution in nutrient film technique (NFT) hydroponic system under fluoride concentration 5 mg/L. Studied plant species were Pityrogramma calomelanos (L.) Link (Silver back Fern), Hydrocotyle umbellate L. (Water Pennywort), Centella asiatica Urban (Asiatic Pennywort), and Brassica rapa L. (Chinese Cabbage). No phytotoxicity was observed from all four plant species. H. umbellata was the best fluoride hyperaccumulator in this experiment follow by Pityrogranuna calomelanos, Brassica rapa and C. asiatica with the BCF value 51, 50, 27 and 13 respectively. Fluoride concentration in roots was higher than shoots in all studied species. As a result of high BCF value, relative performance, and total fluoride uptake per plant, H. umbellata was selected for the accumulation potential study by growing plants under 5, 10 and 15 mg/L of fluoride spiked. There was no visible symptom and differences on biomass production of fluoride spiked treatment comparing with control was not significant (p>0.05). The highest fluoride accumulation was found in 15 mg/L treatment about 1730 mg/kg dry weight in roots at 7th week of exposure as well as the highest BCF value of about 150. Mass balance shown that removal of fluoride from nutrient solution via plants up take was only 1-2 % of fluoride output from hydroponic unit. Total fluoride uptakes at 7th week of exposure were about 60, 110 and 250 g/g dry weights in 5, 10 and 15 mg/L of fluoride spiked nutrient solution respectively |
| Year | 2007 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Environmental Engineering and Management (EV) |
| Chairperson(s) | Preeda Parkpian |
| Examination Committee(s) | Chongrak Polprasert;Visvanathan, C;Suyanee Vessabutr |
| Scholarship Donor(s) | RTG Fellowship |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2007 |