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U – salinity relationships in the Mediterranean: implications for 234Th:238U particle flux studies.

Pates, Jackie M. and Muir, G. K. P. (2007) U – salinity relationships in the Mediterranean: implications for 234Th:238U particle flux studies. Marine Chemistry, 106 (3-4). pp. 530-545. ISSN 0304-4203

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    Abstract

    Knowledge of the 238U concentration in seawater is important for 234Th:238U disequilibrium studies of particle fluxes. However, these concentration data are normally obtained through a standard relationship between 238U and salinity, which has been determined for the open ocean. This study examines 238U data from both the open Mediterranean and the coastal Thermaikos Gulf, Greece, and compares it to the open ocean. No deviation from the open ocean 238U – salinity relationship was found for the Thermaikos Gulf, but some enhancement was noted close to Thessaloniki in the vicinity of a phosphate fertiliser plant. The open Mediterranean data showed a small enhancement relative to the open ocean. Although an analytical bias could not be ruled out, a review of 238U and salinity data in the literature shows that the standard relationship may not be as robust as is often assumed and the 1 % uncertainty typically used is not justified at the present time. Nevertheless, salinity-based derivations continue to be the most appropriate means of determining 238U concentrations for routine applications. We propose a new relationship that accounts for the uncertainties observed, i.e. 238U (dpm l-1) = (0.0713 ± 0.0012) x salinity.

    Item Type: Article
    Journal or Publication Title: Marine Chemistry
    Additional Information: The final, definitive version of this article has been published in the Journal, Marine Chemistry 106 (3-4), 2007, © ELSEVIER.
    Uncontrolled Keywords: uranium concentration seawater U ; Th disequilibrium
    Subjects: Q Science > QD Chemistry
    G Geography. Anthropology. Recreation > GC Oceanography
    Departments: Faculty of Science and Technology > Lancaster Environment Centre
    ID Code: 4504
    Deposited By: Dr Jackie Pates
    Deposited On: 25 Mar 2008 14:58
    Refereed?: Yes
    Published?: Published
    Last Modified: 26 Jul 2012 18:11
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/4504

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