Determination of uranium(VI) in seawater by means of automated flow constant-current cathodic stripping at carbon fibre electrodes |
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Authors: | Chi Hua Daniel Jagner Lars Renman |
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Institution: | Department of Technical Analytical Chemistry, Chemical Centre, University of Lund, P.O. Box 124, S-221 00 Lund Sweden |
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Abstract: | Uranium(VI) is determined in an automated flow system by means of constant-current reductive stripping with a mercury film-coated carbon fibre electrode and catechol as adsorptive reagent at pH 8.6 Interference from iron(III) is eliminated by addition of sulphite. Increased linear range between stripping signal and sample uranium(VI) concentration can be obtained by adding, in the computer, several stripping curves, each obtained after a short period of adsorptive accumulation. It is shown that the hanging mercury drop electrode can be used for the determination of uranium(VI) by means of computerized constant current stripping without the need for inert gas bubbling. The results obtained for uranium(VI) in two reference seawater samples, NASS-1 and CASS-1, were 2.90 and 2.68 μg l?1 with standard deviations (n = 8) of 0.57 and 0.75 μg l?1, respectively. |
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