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Mg2+>Na+>K+, while the anions followed the sequence: SO42- >Cl- >HCO3-. The predominant clay minerals were kaolinite, montmorillonite and illite, accompanied with accessory minerals in the descending order; quartz >gypsum >dolomite >calcite >aragonite >hematite >muscovite > potassium feldspar. The total cobalt (Co) content ranged from 1.42 to 6.51 mgkg-1 and the DTPA-extractable Co content ranged from 0.65 to 1.75 mgkg-1. The successive extraction (fractionation of Co) exhibited that the residual form was the most dominant one where its percentage ranged from 34.01 to 82.90 %. The soluble, exchangeable, carbonate bound, Fe-Mn bound and organic bound forms ranged from: 1.38 to 4.23 %, 5.26 to 45.58 %, 1.79 to 7.34 %, 2.63 to 7.75 %, and 2.29 to 9.52 %, respectively. Thus, it can be said that the following sequence characterized the distribution of Co forms among the different fractions: Residual >>exchangeable >organic-bound >Fe-Mn-bound > carbonate-bound >soluble. Accordinly, the obtained results evidently showed that there were relation between cobalt forms and mineralogical composition of soils.]]>
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