Natural attenuation of arsenic in the wetland system around abandoned mining area

An, J. and Kim, J.Y. and Kim, K.W. and Park, J.Y. and Lee, J.S. and Jang, M. (2011) Natural attenuation of arsenic in the wetland system around abandoned mining area. Environmental Geochemistry and Health, 33 (SUPPL.). pp. 71-80. ISSN 0269-4042

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Abstract

Mechanisms of natural attenuation of arsenic (As) by wetland plants may be classified by plant uptake and adsorption and/or co-precipitation by iron (oxy)hydroxide formed on the root surface of plants or in rhizosediment. A natural Cattail (Typha spp.) wetland impacted by tailings containing high levels of As from the Myungbong abandoned Au Mine, South Korea was selected, and the practical capability of this wetland to attenuate As was evaluated. The As concentrations in the plant tissues from the study wetland were several-fold higher than those from control wetland. SEM-EDX analyses demonstrated that iron plaques exist on the rhizome surface. Moreover, relatively high As contents bonded with hydrous iron oxides were found in the rhizosediments rather than in the bulk sediments. It was revealed through the leaching and sequential extraction analyses that As existed as more stable forms in the wetland sediment compared with adjacent paddy soil, which is also contaminated with As due to input of mine tailings. The As concentration ratios of extracted solution to sediment/soil represented that the wetland sediment showed significant lower values (10-fold) rather than the paddy soil with indicating high As stability. Also, As in the wetland sediment was predominantly bonded with residual phases on the basis of results from sequential extraction analysis. From these results, it is concluded that transformation of As contaminated agricultural field to wetland environment may be helpful for natural attenuation until active remediation action. © 2010 Springer Science+Business Media B.V.

Item Type: Article
Additional Information: An, Jeongyi Kim, Ju-Yong Kim, Kyoung-Woong Park, Ji-Yeon Lee, Jin-Soo Jang, Min eng Research Support, Non-U.S. Gov't Netherlands 2010/11/04 06:00 Environ Geochem Health. 2011 Jan;33 Suppl 1:71-80. doi: 10.1007/s10653-010-9361-3. Epub 2010 Nov 3.
Uncontrolled Keywords: Arsenic, Iron plaque, Mine tailings, Natural attenuation, Wetlands, iron, abandoned mine, bioremediation, mine waste, vascular plant, wetland, adsorption, article, chemistry, environmental monitoring, metabolism, mining, pollutant, sediment, South Korea, Typhaceae, Biodegradation, Environmental, Environmental Pollutants, Geologic Sediments, Republic of Korea, Typha
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering
Depositing User: Mr Jenal S
Date Deposited: 29 Jan 2014 03:14
Last Modified: 29 Jan 2014 03:14
URI: http://eprints.um.edu.my/id/eprint/9182

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