title: Effect of biogeochemical interactions on bioaccessibility of arsenic in soils of a former smelter site in Republic of Korea.
abstract: The total concentration-based regulations for soil remediation do not consider the possible changes in bioaccessibility of remaining arsenic (As) in soils due to biogeochemical interactions after remediation. This study used As-contaminated soil and pore water samples that were collected from the rice paddy and forest/farmland located in the vicinity of a former smelter site in Republic of Korea to elucidate the changes in As bioaccessibility due to biogeochemical interactions. Bioaccessibility and chemical forms of As in soils were determined by using an in vitro method and sequential extraction, respectively, and soil microbial community was evaluated. Bioaccessibility of As in the rice paddy soil samples was higher than that in the forest/farmland soil samples. This could be attributed to relatively higher dependence of bioaccessible As in the rice paddy soils on the soil concentration of iron (Fe), aluminum, or manganese, which could lead to greater changes in bioaccessible As via reductive dissolution. The strong linear relationship (R2= 0.90, p value ≤0.001) between the pore water As and Fe concentrations, and the greater portion of bacterial species related to reductive dissolution of Fe oxides in the rice paddies can support the higher As bioaccessibility promoted by reductive dissolution. Therefore, it is necessary to consider the potential changes in the bioaccessible As due to biogeochemical interactions in remediation of As-contaminated soils, particularly when soils are likely to be reused under reductive dissolution-promoting conditions (e.g., flooded conditions).
authors.affiliation: Department of Civil and Environmental Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 151-742, Republic of Korea.
authors.forename: Kyung
authors.initials: K
authors.lastname: Yang
authors.affiliation: Korea Basic Science Institute, Korea University, 6-7 Inchon-ro 22 gil, Seongbuk-gu, Seoul, 136-075, Republic of Korea.
authors.forename: Seulki
authors.initials: S
authors.lastname: Jeong
authors.affiliation: Department of Environmental Science, Hankuk University of Foreign Studies, 81 Oedae-ro, Mohyeon-myeon, Cheoin-gu, Yongin-si, Gyeonggi-do, 449-791, Republic of Korea. ehjho@hufs.ac.kr.
authors.forename: Eun Hea
authors.initials: EH
authors.lastname: Jho
authors.affiliation: Department of Civil and Environmental Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 151-742, Republic of Korea.
authors.forename: Kyoungphile
authors.initials: K
authors.lastname: Nam
mesh_terms: D001151:Arsenic / Q000737:chemistry*; D001419:Bacteria; D001682:Biological Availability; D052918:Environmental Restoration and Remediation; D065928:Forests; D060587:Groundwater / Q000737:chemistry / Q000382:microbiology; D007501:Iron / Q000737:chemistry*; D008669:Metallurgy; D012275:Oryza; D056910:Republic of Korea; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000737:chemistry*; D014873:Water Pollutants / Q000737:chemistry
chemical_list: D012989:Soil Pollutants; D014873:Water Pollutants; D007501:Iron; D001151:Arsenic
keywords: Arsenic; Bioaccessibility; Biogeochemical interaction; Flooded condition; Reductive dissolution