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 2.4 105 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 0.7340 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.
Document Type: Research Article
Payame Noor University, Department of Chemistry, Kerman, Iran. 2:
Ilam University, Department of Chemistry, Ilam, Iran.
Publication date: May 28, 2009
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