title: Impact of temperature on the aging mechanisms of arsenic in soils: fractionation and bioaccessibility.
abstract: The present study focused on the influence of temperature variation on the aging mechanisms of arsenic in soils. The results showed that higher temperature aggravated the decrease of more mobilizable fractions and the increase of less mobilizable or immobilizable fractions in soils over time. During the aging process, the redistribution of both carbonate-bound fraction and specifically sorbed and organic-bound fraction in soils occurred at various temperatures, and the higher temperature accelerated the redistribution of specifically sorbed and organic-bound fraction. The aging processes of arsenic in soils at different temperatures were characterized by several stages, and the aging processes were not complete within 180 days. Arsenic bioaccessibility in soils decreased significantly by the aging, and the decrease was intensified by the higher temperature. In terms of arsenic bioaccessibility, higher temperature accelerated the aging process of arsenic in soils remarkably.
authors.affiliation: Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang, 050061, China. huangguanxing2004@126.com.|Hebei Key Laboratory of Groundwater Remediation, Shijiazhuang, 050061, China. huangguanxing2004@126.com.
authors.forename: Guanxing
authors.initials: G
authors.lastname: Huang
authors.affiliation: Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang, 050061, China.
authors.forename: Zongyu
authors.initials: Z
authors.lastname: Chen
authors.affiliation: Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang, 050061, China.
authors.forename: Jia
authors.initials: J
authors.lastname: Wang
authors.affiliation: Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang, 050061, China.
authors.forename: Qinxuan
authors.initials: Q
authors.lastname: Hou
authors.affiliation: Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang, 050061, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D001151:Arsenic / Q000737:chemistry* / Q000378:metabolism; D001682:Biological Availability; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry*; D013696:Temperature; D013997:Time Factors
chemical_list: D012987:Soil; D012989:Soil Pollutants; D001151:Arsenic
keywords: Aging mechanisms; Arsenic; Bioaccessibility; Fractionation; Temperature