Analytical Sciences

Abstract − Analytical Sciences, 15(8), 781 (1999).

Solvent-Extraction Separation of Manganese(II) with Calixarene Substituted with an Acetyl Group at the Lower Rim
Dipalee D. MALKHEDE, Purushottam M. DHADKE and Shripad M. KHOPKAR
Department of Chemical Technology, University of Mumbai, Matunga, Mumbai-400019, India
A trace level concentration of Mn(II) was quantitatively extracted at pH 6.0 with 1x10-4 M of hexaacetatocalix(6)arene in hexane. Manganese(II) from the organic phase was stripped with 2 M sulfuric acid and determined as its iodo complex spectrophotometrically at 545 nm. The various parameters influencing extraction, such as pH, reagent concentration, nature of diluents, stripping agents, and effects of diverse ions, were studied to determine the optimum conditions for the separation of Mn(II). Manganese(II) was separated from Fe(III), Th(IV), Cr(III) as well as alkali and alkaline earth elements which are generally associated with it in a complex mixture. The method was extended for an analysis of Mn in real samples, such as minerals, alloys and pharmaceutical samples. The method is reproducible with a relative standard deviation of ±1.2%. (Keywords: Solvent extraction, separation, calix(6)arene, manganese, acetyl derivative)