Contamination Assessment and Potential Human Health Risks of Heavy Metals in Urban Soils from Grand Forks, North Dakota, USA.

The mean concentrations ( Table 1 ) of Mn, Fe, Co, Ni, Cu, Zn, As, Pb, Hg, Cr, Cd and Tl in residential soil were 783.5 μg/g, 20,896 μg/g, 6.708 μg/g, 24.80 μg/g, 17.38 μg/g, 81.58 μg/g, 9.147 μg/g, 14.67 μg/g, 0.060 μg/g, 23.62 μg/g, 0.670 μg/g and 0.377 μg/g, showing a decreasing trend almost similar to that observed in park soils.

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