Application of Dispersive Liquid-Liquid Microextraction in Narrow-Bore Tube for Preconcentration and Spectrophotometric Determination of Cadmium in Aqueous Samples

Abstract

A novel liquid phase microextraction based on narrow bore-dispersive liquid-liquid microextraction (NB-DLLME) is introduced and developed for preconcentration and extraction of cadmium in aquoeus samples using spectrophotometry. Unlike previous NB-DLLME methods, in this research work a solvent with a density higher than water (carbon tetrachloride) is used as extractant solvent. The effects of different parameters such as kind and volume of extractant and dispersive solvent, internal diameter and lengnth of narrow bore, and concentration of salt are studied and optimized. Under optimum conditions, dynamic range of calibration curve was linear in the range of 50-900 μg.L -1 . The detection limit and relative standard deveiation were calculated to be 6.3 μg.L -1 and 6.4%, respectively.