Extraction of iron(III) from nitrate media with bis (2-ethylhexyl) phosphinic acid

Abstract

<span style="font-size:14.0pt;font-family:" times="" new="" roman";="" mso-fareast-font-family:"times="" roman";mso-ansi-language:en-us;mso-fareast-language:="" en-us;mso-bidi-language:ar-sa"="">Solvent extraction of iron (III) from nitrate media using bis(2- ethylhexyl) phosphinic acid as extractant has been proposed. A critical study of various parameters suggest that iron(III) can be quantitatively extracted in the <i style="mso-bidi-font-style:normal">p</i>H range 2.0-4.5 using 0.009 <i>M </i>bis(2- ethylhexyl) phosphinic acid in hexane. The organic phase is stripped using 0.75 <i>M </i><span style="font-size:14.0pt;font-family:Arial;mso-fareast-font-family:" times="" new="" roman";="" mso-ansi-language:en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">HNO₃<span style="font-size:14.0pt;font-family:" times="" new="" roman";mso-fareast-font-family:="" "times="" roman";mso-ansi-language:en-us;mso-fareast-language:en-us;="" mso-bidi-language:ar-sa"=""> and iron(III) determined spectrophotometrically by thiocyanate method. The method is selective and can be applied in the presence of a large number of diverse ions. The method is found to be reproducible when applied for recovery of iron from real samples as well as its separation from other metal ions.</span></span></span>