van Elteren, Johannes T., van den Berg, Constant M. G., Zhang, Hao, Martin, Trevor D. and Achterberg, Eric P. (1995) Automated In-Line Extraction of Uranium(VI) from Raffinate Streams with Online Detection by Cathodic Stripping Voltammetry. Analytical Chemistry, 67 (21). pp. 3903-3910. DOI 10.1021/ac00117a014.

Full text not available from this repository.

Abstract

An automated method for on-site monitoring of uranium(VI) in raffinate streams originating from nuclear fuel reprocessing plants is described. An in-line stripping procedure (based on liquid/liquid extraction) was developed to extract U(VI) from this stream, a solvent mixture of 20% tributyl phosphate and nitric acid in kerosene, into an aqueous sodium sulfate solution, Degradation products in the solvent mixture, especially dibutyl phosphate, give rise to very strong complexes and are responsible for moderate but constant U(VI) recoveries (similar to 50%), Optimal conditions for in-line stripping comprise a mixing ratio of extractant (0.5 M sodium sulfate in water)/solvent mixture of similar to 3 and a pumping rate of similar to 0.4 mL min(-1) of the solvent mixture. The determination of U(VI) was by on-line cathodic stripping voltammmetry (CSV), preceded by adsorptive collection of the U(VL) as an oxine complex onto a hanging mercury drop electrode, Quantities of 1-2 mL of the aqueous extract were pumped into the voltammmetric cell and diluted (1/5 to 1/10) with a background electrolyte containing 0.1 M PIPES buffer, 2 x 10(-4) M oxine, 10(-4) M EDTA, and 0.2 M hydrazine hydrate (pH 9.0), The CSV peak for U(VI) was obtained at -0.68 V with a detection limit of 20 nM in the raffinate stream using an adsorption time of 120 s, Both the inline stripping procedure and the on-line measurement were fully automated, with a relative standard deviation in the measurements of < 5%.

Document Type:	Article
Refereed:	Yes
Open Access Journal?:	No
Publisher:	American Chemical Society
Date Deposited:	04 Feb 2014 11:34
Last Modified:	04 Feb 2014 11:34
URI:	https://oceanrep.geomar.de/id/eprint/23292

Actions (login required)

View Item