Page 321 - Soil and water contamination, 2nd edition

308 Soil and Water Contamination

Depth Cu concentration (mg kg )
-1
0–10 cm 152
10–20 cm 103
20–30 cm 17
30–40 cm 8

4. Regression analysis of Zn concentrations against clay and organic matter content in a
contaminated region yielded the following regression equation:
Zn = 25.6 + 5.5 clay (%) + 16.5 O.M. (%)
A new soil sample from the same region contains 12 percent clay, 3.5 percent organic
-1
matter, and 174 mg kg zinc. Calculate the standardised concentration for a standardised
soil with 25 percent clay and 10 percent organic matter (hint: see equation 16.4). Is the
zinc contamination of this sample more or less than the area average?
5. Name two drawbacks of using contaminant depth profiles in floodplain soils to
reconstruct the contamination history of a river.

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