Mixed Micellar Cloud Point Extraction and Spectrophotometric Determination of Iron(II) Using 1,10-Phenanthroline: Effect of Sodium Nitroprusside on Extraction Efficiency

Abstract

A new cloud point extraction (CPE) procedure with spectrophotometry for the pre-concentration and determination of iron(II) has been developed. In this method, Fe 2+ was complexed with 1,10-phenanthroline at a pH of 4.2. Fe 2+-1,10-phenanthroline complex was then extracted into mixed micelles of Triton X-114 (TX-114) and docusate sodium salt (DOSS). Various parameters such as pH, concentration of 1,10-phenanthroline, concentrations of the surfactants (TX-114 and DOSS), concentration of salt (Na2SO4), equilibration temperature and equilibration time were optimized. Under optimum conditions the linear range of Fe 2+ was found to be 0.14-2.23 µg mL-1. The corresponding detection limit was found to be 5.1 ng mL-1. The proposed method has been successfully applied to the determination of Fe 2+ in tap water and sea water samples. The recoveries were found to be in the range of 80-95 % and the effect of sodium nitroprusside on the recovery was studied.

Determination of Aurintricarboxylic Acid (A Viral Inhibitor) Using Mixed Micellar Cloud Point Extraction Procedures

“…The main advantages of CPE are; utilizing of low cost, non-toxic and non-flammable solvents and compliance with green chemistry principles [6]. Percentage recovery of dye increases by using mixed micelles (non-ionic surfactant with cationic or anionic) when compared to single micelles [7]. In this work, a simple CPE method has been developed for the pre-concentration of ATCA prior to spectrophotometric determination using Triton X-114(TX-114) and tetrabutylammonium bromide (TBAB) mixed micelles.…”