title: Effects of simulated acid rain, EDTA, or their combination, on migration and chemical fraction distribution of extraneous metals in Ferrosol.
abstract: A laboratory repacked soil-leaching column experiment was conducted to study the effects of simulated acid rain or EDTA by themselves or in combination, on migration and chemical speciation distribution of Pb and its alternative rare metals including Ag, Bi, In, Sb, and Sn. Experimental results demonstrate that leaching with simulated acid rain promoted the migration of Bi, In and Pb, and their migration reached down to 8 cm in the soil profile, no enhancement of Sb, Ag or Sn migration was observed. Addition of EDTA significantly enhanced the migration of all six metals, especially Bi, In and Pb. The migration of metals was in the order Pb>Bi>In>Sb>Sn>Ag. The individual and combined effects of acid rain and EDTA increased the environmental risk of metals, by increasing the soluble content of metals in soil solutions and the relative distribution of the exchangeable fraction. Leaching risks of Bi, In and Pb were higher than other three metals.
authors.affiliation: State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, 8 Dayangfang, Beijing 100012, China.
authors.forename: Fang
authors.initials: F
authors.lastname: Wen
authors.forename: Hong
authors.initials: H
authors.lastname: Hou
authors.forename: Na
authors.initials: N
authors.lastname: Yao
authors.forename: Zengguang
authors.initials: Z
authors.lastname: Yan
authors.forename: Liping
authors.initials: L
authors.lastname: Bai
authors.forename: Fasheng
authors.initials: F
authors.lastname: Li
mesh_terms: D015258:Acid Rain / Q000032:analysis* / Q000706:statistics & numerical data; D000538:Aluminum Silicates / Q000737:chemistry; D000077215:Clay; D004492:Edetic Acid / Q000737:chemistry*; D008670:Metals / Q000032:analysis* / Q000737:chemistry; D008956:Models, Chemical; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis* / Q000737:chemistry
chemical_list: D015258:Acid Rain; D000538:Aluminum Silicates; D008670:Metals; D012987:Soil; D012989:Soil Pollutants; D004492:Edetic Acid; D000077215:Clay