Release of cadmium, copper and lead from urban soils of Copenhagen.
We studied the bonding and release kinetics of Cd, Cu and Pb from different soils in the older metropolitan area of Copenhagen. Total Cd, Cu and Pb concentrations were elevated 5-27 times in the urban soils compared to an agricultural reference soil, with Cd and Pb in mainly mobilisable pools and Cu in strongly bound pools. The soils were subjected to accelerated leaching studies in Ca(NO3)2 or HNO3 solutions resulting in release up to 78, 18 and 15% of total Cd, Cu and Pb soil concentrations over a period of 15 weeks. The relative initial Cd and Pb release rates increased 10 fold when pH decreased 2 and 3 units, respectively, while increases in Cu release rates were only seen at pH below 4. The total leachable Cu and Pb pools were higher in urban soils compared the agricultural reference soil but not for Cd.
Department of Plant and Environmental Sciences, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Faculty of Science, University of Copenhagen, Denmark; Institute of Agricultural Environment and Resource, Shanxi Academy Agricultural Sciences, Taiyuan 030006, China.
Lijun
L
Li
Department of Plant and Environmental Sciences, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Faculty of Science, University of Copenhagen, Denmark.
Peter E
PE
Holm
Department of Plant and Environmental Sciences, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Faculty of Science, University of Copenhagen, Denmark. Electronic address: hma@plen.ku.dk.
Helle
H
Marcussen
Department of Plant and Environmental Sciences, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Faculty of Science, University of Copenhagen, Denmark.
Hans Christian
HC
Bruun Hansen
D000383:Agriculture; D002104:Cadmium / Q000032:analysis; D003300:Copper / Q000032:analysis; D003718:Denmark; D004784:Environmental Monitoring; D007854:Lead / Q000032:analysis; D019216:Metals, Heavy / Q000032:analysis*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*
D019216:Metals, Heavy; D012987:Soil; D012989:Soil Pollutants; D002104:Cadmium; D007854:Lead; D003300:Copper
Heavy metal extraction; Leaching; Release rates; Urban soil