Determination of uranium using a flow system with reagent injection. Application to the determination of uranium in ore leachates |
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Authors: | JL Perez Pavon B Moreno Cordero E Rodriguez Garcia Hernandez Mendez |
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Institution: | Department of Analytical Chemistry, Nutrition and Food Sciences, University of Salamanca, Salamanca Spain |
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Abstract: | The determination of uranium by a flow system with reagent injection is based on the reaction of U(IV) with Arsenazo III in 3.6 M HCl; U(IV) is generated by reduction of uranyl ion in a lead reductor minicolumn installed in the sample channel of the manifold. The interference effect caused by several ions is studied. The calibration graph is linear up to 1.0 × 10?5 M (2.4 mg l?1) and the detection limit is 2.8 × 10?8 M (6.6 μg l?1). The modification of the manifold by including a second valve to by-pass the reducing column allows the measurement of the difference in peak heights, which makes the method specific for uranium. |
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