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A flow injection method has been developed for the determination of uranium in natural waters and high-purity aluminum by use of on-line preconcentration on a U/TEVA column and ICP-MS detection. The sample solution prepared as a nitric acid solution in 3 mol l was passed through the U/TEVA column to collect uranium and uranium adsorbed was eluted with 0.1 mol l nitric acid. The effluent was introduced directly into the nebulizer of the ICPMS and U was measured. The detection limit, calculated as 3-times the standard deviation of the background noise, was 3 pg and the sample throughput was about 10 per hour. The proposed method was successfully applied to the determination of uranium in river-water reference materials, a seawater reference material and high-purity aluminum reference materials.

Determination of uranium in natural waters and high-purity aluminum by flow-injection on-line preconcentration and ICP-MS detection