TRACE-ELEMENT CONCENTRATIONS OF SELECTED SOILS AND FERTILIZERS IN SASKATCHEWAN, CANADA

Limited information is available on the trace element contents of soil s and crops in Saskatchewan. Trace elements, to a large extent, are de rived from soil parent materials and partially from anthropogenic acti vities, such as agricultural application of fertilizers. The objective of this study was to establish levels of trace element concentrations of the surface horizons and parent materials of selected soils, ferti lizers, and durum wheat (Triticum durum Desf.). Inductively coupled pl asma mass spectrometry (ICP-MS) having the capacity to determine 60 el ements simultaneously at very low detection levels was used. Trace ele ments for this work are among the most frequently reported in the rece nt literature. We found a positive relationship between the total cont ents of trace elements and percent of clays in the soils, except Se. T his suggests that the major part of the elements studied are associate d with the clay minerals in soils. In two Regina heavy clay soils, tot al Cu, Zn, Se, and ph were higher in the surface soil than the subsoil , but this increase was statistically not significant. All the element s, except Zn, Cd, and Pb, were depleted in soils that have lower clay content in the surface horizon than the parent material. Soils having similar clay contents in the surface horizon and subsoil, total V, Cr, Co, Ni, Zn, Cd, Sn, Sb, TI, and Pb concentrations were higher in the surface horizon, relative to parent material. Only Zn and Cd increases were significant. Enrichment of elements in the surface horizons was, in part, attributed to anthropogenic additions. Experiments with EDTA and DTPA extraction techniques showed that almost half of Co, As and Cd, and other elements in fertilizers were between 4 and 50% in somewh at available form for plants indicating their potential for soil pollu tion.