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Abstract

Adisa, S.J., N.V. Nkongolo, A. Ikem, K. Schmidt, R.M. Paro, N.O. Hoilett and S.S. Johnson. 2008. Baseline concentrations of trace elements in two agricultural soil depths in central Missouri. JEMREST 5:00-00

Potential accumulation of trace elements reaching toxic levels exist for fertilized agricultural soils. We investigated and compared the distribution of trace elements (Al, As, Be, Ca, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, V, Zn) in 104 surface (0-10cm) and sub-surface (10-20cm) soil samples in a corn (Zea mays) field receiving N fertilizer and previously fertilized (under corn prior to rotation) soybean (Glycine max) field in central Missouri. Baseline concentrations and vertical distribution up to 20cm depth of trace elements in these agricultural soils were established. Total concentrations of investigated trace elements were extracted with a mixture of HNO₃, HClO₄ and HF acids using the microwave acid digestion method and analyzed on the inductively coupled plasma –optical emission spectrometer (ICP-OES). Standard reference material (SRM 1944) - New York/New Jersey Waterway sediment was used for the method validation process. The role of soil properties in trace elements distribution and accumulation is discussed.