Abstract
The impact of mineral deposit on their host agricultural soil, available water bodies and near atmospheric environment is of great concern. In this study, mineralogical characterization and leaching kinetics of metals from iron ores in Kogi States, were reported. Physicochemical parameters namely; electrical density, pH, bulk density and moisture content were also investigated. The SEM image of the iron ore appear compact with irregular shape. XRF analysis showed that, iron ore consist of 63.44 % Fe as major element, with the oxide composition of 90.71%. The XRD analysis of iron ore unveiled the presence of magnetite (88 %), hematite (9 %) and quartz (3 %) as associated mineral. Low concentration of iron (0.77-1.70 ppm) was observed to be leached from iron ore in the acidic medium, 0.35-1.10 ppm from basic medium and 0.32-0.88 ppm in the aqueous medium, The Shrinking core, Product-layer diffusion and leaching, controlled by diffusion were the three equations used to model the leaching parameters. The leaching experimental data of iron ore fit best into the diffusion- controlled model, with R2 = 0.94 for the acidic medium Hence, the rate determining step. The analysis shows good fit for the other kinetic models. Overall, result proved that, the environment around mining sites is chiefly contaminated by the metals leached from the ore (mineral) deposits. Hence, the need to monitor the pollution indices, the role of leaching, pollutant fate (transport and reaction) and the subsequent distribution of metals to neighboring environment.
Highlights
Many studies on complexes of transition metal ions with different ligands have been reported due to their importance in biochemical processes [1,2,3,4,5]
We carried out a differential scanning calorimetric (DSC) assay, in which complex 4 showed two endothermic transformations: one at 209 C (-33.94 Kcal/kg-1), corresponding to the pyridine loss and other at 270 C
Despite the inexistence of the octahedral complexes Zn(DHA)2(py)2 and Zn(DHA)2( -pic)2, we studied them by molecular modeling in order to compare their potential structural data with the respective bipyramidal complexes [2, 34,35,36]
Summary
Many studies on complexes of transition metal ions with different ligands have been reported due to their importance in biochemical processes [1,2,3,4,5]. Cadmium, which is environmentally dangerous [9] and widely used in industrial processes, is very toxic. Because 67Zn has a very low natural abundance (4.1%), possesses a low molar receptivity (2.9x10-3 relative to 1H) and a high quadrupolar moment (Q = 15.0 fm2), it is difficult to obtain 67Zn NMR spectra. Because of these properties, the exchange of Zinc for Cadmium has been used in solution and in the solid state to examine the metal complexation environment of zinc-containing biomolecules by 113Cd NMR [12,13,14]. It has been shown that Zn substitution for Cd leads to important changes in the coordination geometry of complexes with dehydroacetic acid [13,14,15]
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