Liquid-liquid extraction and separation of lead(ii) by using N-n-octylcyclohexylamine as an extractant: analysis of real samplesElectronic supplementary information (ESI) available. See DOI: 10.1039/c6ay00887a

• Main Authors: Kokare, Arjun, Suryavanshi, Vishal, Zanje, Sunil, Kore, Gurupad, Anuse, Mansing
• Format: Journal Article
• Published: 11.08.2016
• ISSN: 1759-9660; 1759-9679
• DOI: 10.1039/c6ay00887a

A method for the determination of micro amounts of lead( ii ) is described. N-n -Octylcyclohexylamine ( N-n -OCA) was employed as an ion-pair forming a neutral [ N-n -OCAH + PbCl 3 − ] complex in hydrochloric acid medium. The quantitative extraction of lead( ii ) was observed with N-n -OCA (0.03 to 0.055 M) in a dichloromethane (DCM) and xylene mixture (1 : 4), from hydrochloric acid medium (3.0 to 5.0 M). The extracted ion-pair complex was back stripped with 0.5 M nitric acid and determined spectrophotometrically with PAR. The quantitative extraction of lead( ii ) was found in the DCM : xylene ratio of 1 : 4 as a mixed solvent system. The various parameters studied, such as concentration of acid, N-n -OCA concentration, equilibrium time, solvent study, back stripping agents and loading capacity were optimized for the quantitative extraction of lead( ii ). The stoichiometry of the extracted ion-pair complex was determined on the basis of the slope analysis method, and it was found to be 1 : 3 : 1 (metal : chloride : extractant). The proposed method was successfully applied to the analysis of diverse ions, binary mixtures of associated metal ions, ternary mixtures, alloys, ayurvedic samples and water samples, by using N-n -OCA and lead( ii ) was determined using PAR and the results of analysis were confirmed by ICP-OES. Herein, we have developed a solvent extraction system for lead( ii ) with N-n -octylcyclohexylamine from HCl medium.