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 NBDLLME 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