Liquid-liquid extraction of cobalt(II) and manganese(II) with bis(2,4,4-trimethylpentyl)monothiophosphinic acid (Cyanex 302)

Abstract

<span style="font-size:11.0pt;line-height: 115%;font-family:Calibri;mso-fareast-font-family:" dejavu="" sans";mso-bidi-font-family:="" mangal;color:#00000a;mso-ansi-language:en-us;mso-fareast-language:en-us;="" mso-bidi-language:ar-sa"="" lang="EN-US">Liquid-liquid extraction of cobalt(II) and manganese(II) were carried out from sulphate solution with Cyanex 302 in toluene as the diluent. Cobalt(II) was quantitatively extracted at <i>p</i>H 7.0-7.5 in the presence of 1.0 M ammonium sulphate with 7.5 x 10^-3M Cyanex 302 while the extraction of manganese(II) was quantitatives at <i>p</i>H 8.5-9.5 in the presence of 0.1 M ammonium sulphate with 5 x 10^-3M Cyanex 302. Cobalt(II) from the organic phase was stripped with 1.0 M hydrochloric acid while manganese(II)was stripped with 1.0 M sulphuric acid. Both metals were separated from complex mixtures of several metals. These methods were extended for the determination of cobalt and manganese in real samples.</span>