Cathodic Adsorptive Stripping Voltammetric Determination of Trace Amounts of Uranium (VI) Based on Its Complex with Chromazorul-S
Abstract: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
Publication date: 2009-05-28
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- The Journal of AOAC INTERNATIONAL publishes refereed papers and reviews in the fields of chemical, biological and toxicological analytical chemistry for the purpose of showcasing the most precise, accurate and sensitive methods for analysis of foods, food additives, supplements and contaminants, cosmetics, drugs, toxins, hazardous substances, pesticides, feeds, fertilizers and the environment available at that point in time. The scope of the Journal includes unpublished original research describing new analytical methods, techniques and applications; improved approaches to sampling, both in the field and the laboratory; better methods of preparing samples for analysis; collaborative studies substantiating the performance of a given method; statistical techniques for evaluating data. The Journal will also publish other articles of general interest to its audience, e.g., technical communications; cautionary notes; comments on techniques, apparatus, and reagents.
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