A micro mixed micelle-mediated preconcentration procedure for spectrophotometric determination of uranium in real and synthetic samples

A micro-cloud point extraction method was discussed for preconcentration and spectrophotometric quantification of U(VI). The method depends on complex formation between U(VI) and 2-(4-sulphophenyloazo)-1,8-dihydroxy-3,6-naphtalenedisulphonic acid (SPADNS) at pH 7.0 and subsequent extraction of the complex in a mixed surfactant medium (cethyltrimethyl ammonium bromide and Triton X-114). The separation was carried out in the presence of 1% Na2SO4 at room temperature. The calibration curve was linear up to 3000 A mu g L-1. The enrichment factor, detection limit and precision were 16.0, 1.05 A mu g L-1, and 2.3%, respectively. The method was employed for the determination of U(VI) in real samples with different matrices.