Assessment of the Driving Pollution Factors of Soil Environmental Quality Based on China's Risk Control Standard: Multiple Bigdata-Based Approaches with Intensive Sampling.

[ 42 ] reviewed surveys compiled from 2008 to 2012 in the Russian Federation, reporting that the average contents of mobile species of heavy metals (Cu, Zn, Cd, Pb, Ni, Cr, Hg) were several times lower than the allowed maximum permissible concentrations [ 55 ], and reported a decreasing trend both in the country scale and federal districts scale.

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