Solvation of thiocyanate complexes of tungsten(VI) by 5-(4-pyridyl) nonane from aqueous hydrochloric acid solutions |
| |
Authors: | M. I. Butt A. Mamoon R. Siddique M. Ejaz |
| |
Affiliation: | (1) Department of Chemical Engineering, College of Engineering, King Abdul Aziz University, P. O. Box 9027, Jeddah, (Saudi Arabia) |
| |
Abstract: | 5-(4-Pyridyl)nonane has been evaluated as a solvent for trace amounts (<5·10–5 M) of tungsten(VI) from aqueous chloride-thiocyanate solutions. Remarkable enhancements in metal extractability are observed on the addition of SCN– to aqueous hydrochloric acid solutions. Extremal partition coefficients are obtained from 0.1 M HCl in 0.2 M KSCN. Diminutions of the metal extractability are produced by relatively high (>0.5 M) SCN– concentrations and increased concentration of the supporting acid. Slope analysis data, under optimal parameters, indicates the most probable composition of the extractable species as WO2(SCN)2·2PYN. Neutral anions do not have any significant effect on the D values. Behaviour of a number of metal ions has been checked using optimal aqueous conditions of extraction. The investigation shows that the reagent has a great potential for the preconcentration of a number of metal ions including the common toxins. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|