Author/Authors :
مظلومي فر، علي نويسنده Department of Chemistry, Shahre Ray Branch, Islamic Azad University, Tehran, Iran Mazloomifar, Ali , احدي، مليحه نويسنده Department of Chemistry, Shahre Ray Branch, Islamic Azad University, Tehran, Iran Ahadi, Maliheh
Abstract :
A selective and simple method for separation and preconcentration of Zn2+ ions was developed by homogeneous liquid-liquid extraction method based on the pH dependent phase separation phenomenon was studied in the water-acetic acid-chloroform ternary solvent system. Phenanthraquinone monophenyl thiosemicarbazone (PPT) was investigated as a suitable selective complexing ligand for Zn2+ ions. Under optimum conditions the extraction efficiency % of Zn2+ was 96.2% and concentration factor 800-fold (i.e. 50µL the sedimented phase was produced from 40 mL of the aqueous phase). The proposed homogeneous liquid-liquid extraction method was applied as a preconcentration method for the spectrophotometric determination of Zn2+ with PPT. The calibration graph was linear over the range 0.20 – 1.20 ng mL-1. The relative standard deviation (RSD%) for the central value of calibration curve was (1.56%) for 10 determinations and the detection limit was 0.06 ng mL-1. The proposed method was applied for the extraction and determination of Zn2+ in natural water samples with satisfactory results.
