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Abstract Detail

Heavy Metals and Phytoremediation

Yeh, Kuo-Chen [1], Liang, Hong-Ming [2].

Model evaluation of the phytoremediation potenital in hyperaccumulators and nonhyperaccumulators.

Phytoremediation has gained increased attention to remove, contain, or detoxify environmental contaminants in the past 10 years. Due to spatial variability of soil constitutions in the fields, large variability in trace element concentrations were influenced by both physical and chemical factors. To evaluate the remediation ability of Zn, Cd and As from hyperaccumulators through greenhouse studies was limited compare with the complex combination of inorganic elements in the field. To bridge the gap between greenhouse studies and field applications on applying phytoremediation is a novel idea and warrants such investigation. Using published data from field surveys, we examine the correlation between shoot and soil concentrations in a log-linear fashion over four orders of magnitude. The remediation ability of Cd/Zn hyperaccumulators, Arabidopsis halleri and Thlaspi caerulescens, and arsenic hyperaccumulator, Pteris vittata, compared with nonhyperaccumulators, Nicotiana tabacum and Brassica juncea, were assessed by mathematical modeling. Recursive formula algorithm was then used to evaluate how many harvest cycles were required to clean the contaminated site to meet the allowable EPA criteria. Our results demonstrated that in spite of higher bioconcentration factor of each hyperaccumulator, metal removal is still limited due to its lower biomass. This approach provides a critical point made toward the development of high biomass plants with improved phytoremediation potential use in environmental cleanup for further studies.

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1 - Academia Sinica, Agricultural Biotechnology Research Center, 128 Academia Rd. Sect 2, Taipei, Taiwan, ROC
2 - Academia Sinica, Agricultural Biotechnology Research Center

none specified

Presentation Type: Plant Biology Abstract
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P05024
Abstract ID:2626

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