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Effect of the Physicochemical Properties of Soil on the Arsenic Bioaccessibility  

Yang, Jae-Kyu (Department of Environmental Engineering, Kwangwoon University)
Chang, Yoon-Young (Department of Environmental Engineering, Kwangwoon University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.28, no.7, 2006 , pp. 731-737 More about this Journal
Abstract
Four well-characterized soils collected from A- and B-horizon in the Department of Energy Oak Ridge Reservation in USA, mainly distributed with Inceptisol(Inc) and Ultisol(Ult) soils, were used in this work. The bioaccessibility of arsenic as well as oxidation phenomena of As(III) was investigated with soils spiked with As(III) and As(V) using a physiologically based extraction test(PBET) at pH 1.5 and 1:100 soil to solution ratio. Also effect of aging time on the bioaccessibility of arsenic was investigated over the 6 months. After 48 hours(fresh) contacting As(V) solution with soils, all soils rapidly and strongly sequestrated As(V), especially Ult-B. However, little sequestration was observed after 3-months. When As(III) was spiked on the same soils, a great portion of As(III) was oxidized to As(V) after 48 hrs, especially Inc-A and Ult-A soils, which is strongly related with Mn content in soils. By using As(III)-spiked soils, much reduced bioaccessibility as total arsenic was observed from Inc-B and Ult-B soils over the 6 months aging time compared to that from Inc-A and Ult-A soils. This result can be explained by the continuous sequestration of As(V), produced from oxidation of As(III), onto Inc-B and Ult-B soils having much amount of iron. The trend of As(III) sequestration over six months aging time was quite similar with that of As(V) sequestration.
Keywords
Arsenic; Bioaccessibility; Oxidation; Sequestration;
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Times Cited By KSCI : 1  (Citation Analysis)
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