Cathodic adsorptive stripping voltammetric determination of trace amounts of uranium (VI) based on its complex with Chromazorul-S
Mohadesi, A.; Hosseinzadeh, L.; Abbasi, S.; Esfandyarpour, M.
Journal - Association of Official Analytical Chemists 92(3): 927-932
2009
ISSN/ISBN: 0004-5756 PMID: 19610387 Document Number: 630640
An adsorptive stripping voltammetric procedure for trace determination of uranium (U; VI) at a hanging mercury drop electrode is described. The complex of U(VI) with Chromazorul-S was adsorbed and accumulated from an ammonia buffer solution of pH 8.8, including 2.4 x 10(-5) M Chromazorul-S at the potential -0.2 V for 120 s. After that, the cathodic voltammograms were recorded by potential sweep from -0.2 to -0.9 V in the differential pulse mode. The relationship between the cathodic peak currents versus U(VI) concentrations was linear over the range of 0.7-340 ng/mL. The detection limit was 0.1 ng/mL, and the relative standard deviations (7 determinations) at 10, 100, and 300 ng/mL U(VI) were 2.1, 1.6, and 1.1%, respectively. The validity of this method was estimated by determination of spiked U(VI) in natural water and soil samples. The results were successful.