title: Arsenic speciation and bioaccessibility in arsenic-contaminated soils: sequential extraction and mineralogical investigation.
abstract: In this study, a combination of sequential extraction and mineralogical investigation by X-ray diffraction and X-ray photoelectron spectroscopy was employed in order to evaluate arsenic solid-state speciation and bioaccessibility in soils highly contaminated with arsenic from mining and smelting. Combination of these techniques indicated that iron oxides and the weathering products of sulfide minerals played an important role in regulating the arsenic retention in the soils. Higher bioaccessibility of arsenic was observed in the following order; i) arsenic bound to amorphous iron oxides (smelter-2), ii) arsenic associated with crystalline iron oxides and arsenic sulfide phase (smelter-1), and iii) arsenic associated with the weathering products of arsenic sulfide minerals, such as scorodite, orpiment, jarosite, and pyrite (mine). Even though the bioaccessibility of arsenic was very low in the mine soil, its environmental impact could be significant due to its high arsenic concentration and mobility.
authors.affiliation: Department of Environmental Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju, Jeollabukdo 561-675, Republic of Korea.
authors.forename: Eun Jung
authors.initials: EJ
authors.lastname: Kim
authors.affiliation: Department of Environmental Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju, Jeollabukdo 561-675, Republic of Korea.
authors.forename: Jong-Chan
authors.initials: JC
authors.lastname: Yoo
authors.affiliation: Department of Environmental Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju, Jeollabukdo 561-675, Republic of Korea. Electronic address: kbaek@jbnu.ac.kr.
authors.forename: Kitae
authors.initials: K
authors.lastname: Baek
mesh_terms: D001151:Arsenic / Q000032:analysis* / Q000737:chemistry; D001152:Arsenicals / Q000032:analysis; D004784:Environmental Monitoring; D004787:Environmental Pollution; D052918:Environmental Restoration and Remediation; D005290:Ferric Compounds / Q000032:analysis; D007501:Iron / Q000032:analysis; D008903:Minerals / Q000032:analysis*; D008906:Mining; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis* / Q000737:chemistry; D013431:Sulfates / Q000032:analysis; D013440:Sulfides / Q000032:analysis; D014961:X-Ray Diffraction
chemical_list: D001152:Arsenicals; D005290:Ferric Compounds; D008903:Minerals; D012987:Soil; D012989:Soil Pollutants; D013431:Sulfates; D013440:Sulfides; C492331:jarosite; C011342:pyrite; C000499:ferric oxide; C045816:arsenic trisulfide; D007501:Iron; D001151:Arsenic
keywords: Arsenic; Bioaccessibility; Soil; Solid-state speciation