Characterization on arsenic sorption and mobility of the sediments of Chia-Nan Plain, where Blackfoot disease occurred |
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Authors: | Zhaohui Li Hanlie Hong Jiin-Shuh Jean Andria J. Koski Chia-Chuan Liu Selim Reza Jeffrey J. Randolph Stephan R. Kurdas Jonathan H. Friend Sarah J. Antinucci |
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Affiliation: | (1) The Faculty of Earth Sciences, China University of Geosciences, Wuhan, 430074, Hubei, China;(2) Geosciences Department, University of Wisconsin-Parkside, Kenosha, WI 53144, USA;(3) Department of Earth Sciences, National Cheng Kung University, 1 University Road, Tainan, 70101, Taiwan |
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Abstract: | Higher levels of arsenic in the aquifers of Chia-Nan Plain in southwestern Taiwan were attributed to the cause of Blackfoot disease in the area half a century ago. Although extensive studies were conducted on the occurrence, speciation, mobility, and transport of arsenic in the region, the relationship between arsenic adsorption by different aquifer materials and the concentration and speciation of arsenic in these aquifers was poorly delineated. This study focused on characterization of sediments in the region, as well as determination of relations between arsenic adsorption and other geochemical and clay mineralogical properties of the sediments. The arsenic adsorption capacity was positively related to the clay minerals, Fe, and Mn contents in the sediments. The higher arsenic adsorption capacity of the sediments served as a sink for the arsenic during its transport from the central mountains to the coast and as a source for its release under reduced environment and in the presence of humic substances. |
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