For example, Soil contaminated by metals such as As, Se, Hg, Pb, Ni, Co, Cr was discovered in many places around the factory, the area of mining and mineral processing, cross traffic. The land near the color metallurgy factory contaminated by Zn, Cd < depth 10 cm. in the leap on this metal concentrations. So to land contamination study to choose appropriate sampling depth (in the above mentioned case should sample < 10 cm depth).
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