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Determination of 238u/235u, 236u/238u and uranium concentration in urine using sf-icp-ms and mc-icp-ms: an interlaboratory comparison

Parrish, Randall R., Thirlwall, Matthew F., Pickford, Chris, Horstwood, Matthew, Gerdes, Axel, Anderson, James and Coggon, David (2006) Determination of 238u/235u, 236u/238u and uranium concentration in urine using sf-icp-ms and mc-icp-ms: an interlaboratory comparison Health Physics, 90, (2), pp. 127-138. (doi:10.1097/01.HP.0000174809.43871.54).

Record type: Article

Abstract

Accidental exposure to depleted or enriched uranium may occur in a variety of circumstances. There is a need to quantify such exposure, with the possibility that the testing may post-date exposure by months or years. Therefore, it is important to develop a very sensitive test to measure precisely the isotopic composition of uranium in urine at low levels of concentration. The results of an interlaboratory comparison using sector field (SF)-inductively coupled plasma-mass spectrometry (ICP-MS) and multiple collector (MC)-ICP-MS for the measurement of uranium concentration and U/U and U/U isotopic ratios of human urine samples are presented. Three urine samples were verified to contain uranium at 1-5 ng L and shown to have natural uranium isotopic composition. Portions of these urine batches were doped with depleted uranium (DU) containing small quantities of U, and the solutions were split into 100 mL and 400 mL aliquots that were subsequently measured blind by three laboratories. All methods investigated were able to measure accurately U/U with precisions of approximately 0.5% to approximately 4%, but only selected MC-ICP-MS methods were capable of consistently analyzing U/U to reasonable precision at the approximately 20 fg L level of U abundance. Isotope dilution using a U tracer demonstrates the ability to measure concentrations to better than +/-4% with the MC-ICP-MS method, though sample heterogeneity in urine samples was shown to be problematic in some cases. MC-ICP-MS outperformed SF-ICP-MS methods, as was expected. The MC-ICP-MS methodology described is capable of measuring to approximately 1% precision the U/U of any sample of human urine over the entire range of uranium abundance down to <1 ng L, and detecting very small amounts of DU contained therein.

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Published date: February 2006

Identifiers

Local EPrints ID: 24457
URI: http://eprints.soton.ac.uk/id/eprint/24457
ISSN: 0017-9078
PURE UUID: e9ccc29b-554b-436b-9dd6-ffafc7e28d36
ORCID for David Coggon: ORCID iD orcid.org/0000-0003-1930-3987

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Date deposited: 30 Mar 2006
Last modified: 17 Jul 2017 16:13

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Contributors

Author: Randall R. Parrish
Author: Matthew F. Thirlwall
Author: Chris Pickford
Author: Matthew Horstwood
Author: Axel Gerdes
Author: James Anderson
Author: David Coggon ORCID iD

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