Mobility of Arsenic and Heavy Metals in a Sandy-Loam Textured and Carbonated Soil  

作　　者：I. GARC íA M. DIEZ F. MART íN M. SIMóN C. DORRONSORO 

机构地区：[1]Departamento Edafologia y Quimica Agricola, CITE IIB, Carretera Sacramento s/n, 04120, University of Almeria (Spain) [2]Departamento Edafologia y Quimica Agricola, Campus Fuentenueva s/n, 18002, University of Granada (Spain)

出　　处：《Pedosphere》2009年第2期166-175,共10页土壤圈（英文版）

基　　金：Project supported by the Science and Technology Ministry of Spain (Nos.REN 2003-03615 and CGL2006-10233)

摘　　要：The continued effect of the pyrite-tailing oxidation on the mobility of arsenic, lead, zinc, cadmium, and copper was studied in a carbonated soil under natural conditions, with the experimental plot preserved with a layer of tailing covering the soil during three years. The experimental area is located in Southern Spain and was affected by a pyrite-mine spill. The climate in the area is typically Mediterranean, which determines the rate of soil alteration and element mobility. The intense alteration processes that occurred in the soil during three years caused important changes in its morphology and a strong degradation of the main soil properties. In this period, lead concentrated in the first 5 mm of the soil, with concentrations higher than 1500 mg kg?1, mainly associated to the neoformation of plumbojarosite. Arsenic was partially leached from the first 5 mm and mainly concentrated between 5–10 mm in the soil, with maximum values of 1239 mg kg-1; the retention of arsenates was related to the neoformation of iron hydroxysulfates (jarosite, schwertmannite) and oxyhydroxides (goethite, ferrihydrite), both with a variable degree of crystallinity. The mobility of Zn, Cd, and Cu was highly affected by pH, producing a stronger leaching in depth; their retention was related to the forms of precipitated aluminium and, in the case of Cu, also to the neoformation of hydroxysulfate.The continued effect of the pyrite-tailing oxidation on the mobility of arsenic, lead, zinc, cadmium, and copper was studied in a carbonated soil under natural conditions, with the experimental plot preserved with a layer of tailing covering the soil during three years. The experimental area is located in Southern Spain and was affected by a pyrite-mine spill. The climate in the area is typically Mediterranean, which determines the rate of soil alteration and element mobility. The intense alteration processes that occurred in the soil during three years caused important changes in its morphology and a strong degradation of the main soil properties. In this period, lead concentrated in the first 5 mm of the soil, with concentrations higher than 1 500 mg kg^-1, mainly associated to the neoformation of plumbojarosite. Arsenic was partially leached from the first 5 mm and mainly concentrated between 5-10 mm in the soil, with maximum values of 1 239 mg kg^-1; the retention of arsenates was related to the neoformation of iron hydroxysulfates （jarosite, schwertmannite） and oxyhydroxides （goethite, ferrihydrite）, both with a variable degree of crystallinity. The mobility of Zn, Cd, and Cu was highly affected by pH, producing a stronger leaching in depth; their retention was related to the forms of precipitated aluminium and, in the case of Cu, also to the neoformation of hydroxysulfate.

关 键 词：ARSENIC heavy metals oxidation pyrite-tailing SOIL 

分 类 号：X53[环境科学与工程—环境工程]