Page 301 - Soil and water contamination, 2nd edition

288 Soil and Water Contamination

Clay % Asmg kg -1 Zn mg kg -1
22 12.0 110
20 11.2 100
18 10.4 90
16 9.6 80
14 8.8 70
12 8.0 60
10

6642 6642 6642

Figure 16.2 Patterns of clay content and the concentrations of As and Zn within the topsoil of a field near Pozzuolo
del Friuli, Italy (source: Paolo De Zorzi, personal communication).

a Zinc b Lead
2000 2000 600 600
Zn concentration (mg/kg) Pb concentration (mg/kg)
1500 1500 500 500
400
400
1000
1000 300 300
500 200 200
500
100 100
0
0 0 0
20 40 50 20 40 50
10 10 20 30 10 20 30
0 10
% OM % <2µm % OM 0 % <2µm
c Copper
200 200
Meuse sediment
Cu concentration (mg/kg)
150 150 Waal sediment
Fossil sediment
100 100

50 50

0 0
20 40 50
10 10 20 30
0
% <2µm
% OM 6955
Figure 16.3 Regression surfaces of metal concentrations as function of clay and organic matter content
(Middelkoop, 1997).

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