title: EDTA-assisted leaching of Pb and Cd from contaminated soil.
abstract: Lead (Pb) and cadmium (Cd) contamination of soil and its harmful effects on human and environmental health have been one concern. In this study, batch and column leaching experiments were conducted to investigate the effects of two EDTA-assisted leaching methods, continuous and intermittent (dry-wet alternate), on the removal of Pb and Cd from contaminated soil. Total content and fractions of Pb and Cd at every 1 cm soil column depth were analyzed before and after the leaching. The results indicated that continuous leaching removed 75.43% of Pb (19.370 mg) and 53.21% of Cd (6.168 mg) and intermittent leaching removed 78.08% of Pb (20.051 mg) and 57.37% of Cd (6.650 mg), which showed intermittent leaching removed more Pb and Cd, but didn't differ significantly (P > 0.05) compared to the continuous leaching. In both leaching methods, total Pb and Cd content in all soil depths reduced after leaching. The two leaching methods made no significant differences in Pb and Cd distributions at different depths of the soil column.
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, China.
authors.forename: Jiangbo
authors.initials: J
authors.lastname: Qiao
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, 712100, China.
authors.forename: Huimin
authors.initials: H
authors.lastname: Sun
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, China.
authors.forename: Xiuhua
authors.initials: X
authors.lastname: Luo
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, China.
authors.forename: Wang
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Soil Science Department, North Dakota State University, ND, 58108-6050, United States.
authors.forename: Shiny
authors.initials: S
authors.lastname: Mathews
authors.affiliation: College of Natural Resources and Environment, Northwest A&F University, Yangling, 712100, China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, 712100, China. Electronic address: xqyin@nwsuaf.edu.cn.
authors.forename: Xianqiang
authors.initials: X
authors.lastname: Yin
mesh_terms: D002104:Cadmium / Q000032:analysis / Q000737:chemistry*; D002614:Chelating Agents / Q000737:chemistry*; D004492:Edetic Acid / Q000737:chemistry*; D004787:Environmental Pollution; D007854:Lead / Q000032:analysis / Q000737:chemistry*; D012987:Soil; D012989:Soil Pollutants / Q000032:analysis*
chemical_list: D002614:Chelating Agents; D012987:Soil; D012989:Soil Pollutants; D002104:Cadmium; D007854:Lead; D004492:Edetic Acid
keywords: Cd; Contaminated soil column; EDTA; Leaching; Pb