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Release of cadmium, copper and lead from urban soils of Copenhagen.

Release of cadmium, copper and lead from urban soils of Copenhagen.

Environmental pollution (Barking, Essex : 1987) (2014-01-28)

Lijun Li, Peter E Holm, Helle Marcussen, Hans Christian Bruun Hansen

ABSTRACT

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.

MATERIALS

Product Number

Brand

Product Description

Sigma-Aldrich

Cadmium, powder, −100 mesh, 99.5% trace metals basis

Sigma-Aldrich

Cadmium, shot, 3 mm, 99.999% trace metals basis

Sigma-Aldrich

Cadmium, granular, 30-80 mesh, ≥99%

Sigma-Aldrich

Cadmium, granular, ≥99%, 5-20 mesh

Cadmium, foil, 6mm disks, thickness 0.25mm, as rolled, 99.9%

Cadmium, foil, 6mm disks, thickness 0.125mm, as rolled, 99.95%

Cadmium, foil, not light tested, 50x50mm, thickness 0.01mm, 99.7+%

Cadmium, foil, light tested, 25x25mm, thickness 0.01mm, 99.7+%

Cadmium, tube, 500mm, outside diameter 2.29mm, inside diameter 1.27mm, wall thickness 0.51mm, 99.95+%

Cadmium, foil, 50mm disks, thickness 0.5mm, as rolled, 99.95%

Cadmium, foil, not light tested, 100x100mm, thickness 0.01mm, 99.7+%

Cadmium, foil, 150x150mm, thickness 0.5mm, as rolled, 99.99%

Cadmium, wire reel, 0.5m, diameter 0.70mm, as drawn, 99.99+%

Cadmium, foil, 25mm disks, thickness 0.25mm, as rolled, 99.9%

Cadmium, foil, 100x100mm, thickness 0.125mm, as rolled, 99.95%

Cadmium, foil, 25mm disks, thickness 0.5mm, as rolled, 99.95%

Cadmium, foil, 4mm disks, thickness 0.125mm, as rolled, 99.99+%

Cadmium, wire reel, 0.2m, diameter 0.5mm, hard, 99.99+%

Cadmium, foil, 15mm disks, thickness 0.25mm, as rolled, 99.95%

Cadmium, foil, 150x150mm, thickness 0.25mm, as rolled, 99.95%

Cadmium, foil, 10mm disks, thickness 0.25mm, as rolled, 99.9%

Cadmium, wire reel, 0.5m, diameter 1.2mm, as drawn, 99.99+%

Cadmium, foil, 25mm disks, thickness 1.0mm, as rolled, 100%

Cadmium, foil, 10mm disks, thickness 1.0mm, as rolled, 99.95%

Cadmium, foil, 95x100mm, thickness 0.5mm, as rolled, 99.99%

Cadmium, foil, 100x100mm, thickness 0.25mm, as rolled, 99.99+%

Cadmium, foil, 300x1000mm, thickness 2.0mm, as rolled, 99.99%

Cadmium, foil, 4mm disks, thickness 0.125mm, as rolled, 99.95%

Cadmium, wire reel, 0.2m, diameter 0.5mm, hard, 99.95+%

Cadmium, wire reel, 2m, diameter 0.70mm, as drawn, 99.99+%