METALS IN SOILS OF SOME AGRICULTURAL WATERSHEDS IN ONTARIO

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Abstract
The total concentrations of seven metals (Cr, Zn, Cu, Ni, Pb, Cd and Hg) and two non-metals (As and Se) in the Ap horizons of 26 soils from six agricultural watersheds in Southwestern Ontario were consistent with normal background levels of agricultural soils. The concentrations of Se, Hg, Pb and Zn were higher in the Ap than in the C horizon. In the Ap horizon, the metals but not the non-metals were usually correlated significantly with the amounts of organic matter, clay, Al and Fe but the magnitude of the coefficients (r) was not high. There was an enrichment of Cu and Ni along with clay, Al and Fe in the B horizons of the soils. The concentrations of DTPA-extractable Zn, Cu, Ni, Pb and Cd were considerably higher in the Ap than in the C horizon of the soils. Furthermore, of the total concentrations of these five metals present, DTPA removed a larger proportion from the Ap than from the lower horizons.

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