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A spectrophotometric study of cerium IV and chromium VI species in nuclear fuel reprocessing process streams

Nickson, I. D. and Boxall, C. and Jackson, A. and Whillock, G. O. H. (2010) A spectrophotometric study of cerium IV and chromium VI species in nuclear fuel reprocessing process streams. IOP Conference Series: Materials Science and Engineering, 9 (1). -. ISSN 1757-899X

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Abstract

Nuclear fuel reprocessing schemes such as PUREX and UREX utilise HNO3 media. An understanding of the corrosion of process engineering materials such as stainless steel in such media is a major concern for the nuclear industry. Two key species are cerium and chromium which, as Ce(IV), Cr(VI), may act as corrosion accelerants. An on-line analytical technique for these quantities would be useful for determining the relationship between corrosion rate and [Ce(IV)] and [Cr(VI)]. Consequently, a strategy for simultaneous quantification of Ce(IV), Cr(VI) and Cr(III) in the presence of other ions found in average burn-up Magnox / PWR fuel reprocessing stream (Fe, Mg, Nd, Al) is being developed. This involves simultaneous UV-vis absorbance measurement at 620, 540, 450 nm, wavelengths where Ce and Cr absorb but other ions do not. Mixed solutions of Cr(VI) and Ce(IV) are found to present higher absorbance values at 540 nm than those predicted from absorbances recorded from single component solutions of those ions. This is attributed to the formation of a 3: 1 Cr(VI)-Ce(IV) complex and we report on the complexation and UV-visible spectrophotometric characteristics of this species. To the best of our knowledge this is the first experimental study of this complex in aqueous nitric acid solution systems.

Item Type: Article
Journal or Publication Title: IOP Conference Series: Materials Science and Engineering
Uncontrolled Keywords: STAINLESS-STEEL ; NITRIC-ACID ; CORROSION
Subjects: UNSPECIFIED
Departments: Faculty of Science and Technology > Engineering
ID Code: 52996
Deposited By: ep_importer_pure
Deposited On: 05 Mar 2012 13:31
Refereed?: Yes
Published?: Published
Last Modified: 09 Apr 2014 23:12
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/52996

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