engleski

Synergistic Effect of Thiocyanate and Perchlorate Ions on Tantalum(V) Extraction with 3-Hydroxy-2-Methyl-1-Phenyl-4-Pyridone

The extraction of tantalum(V) from aqueous oxalic solution with 3-hydroxy-2-methyl-1-phenyl-4-pyridone (HX) dissolved in chloroform in the presence of an excess of thiocyanate and perchlorate ions was examined at different acidities and ionic strengths. Thiocyanate and perchlorate ions produced a synergistic effect on the tantalum extraction with HX. In the presence of an excess of thiocyanate or perchlorate ions tantalum(V) was quantitatively extracted from a more acidic solution (pH 2, 3-3 M H2SO4) with less excess of HX and in the presence of a higher concentration of oxalic, tartaric or, tartaric or citric acids or their anions.Optimum conditions for the extraction of tantalum(V) as a mixed thiocyanate-HX or perchlorate-HX complex from the aqueous phase of different composition were determined. The compositions of the extracted complexes were studied and discussed.

nije evidentirano

nije evidentirano