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    Thorium speciation in seawater

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    MARCHE2301.pdf (1.533Mb)
    Date
    2005-07
    Author
    Santschi, Peter H.  Concept link
    Murray, James W.  Concept link
    Baskaran, Mark  Concept link
    Benitez-Nelson, Claudia R.  Concept link
    Guo, L. D.  Concept link
    Hung, C.-C.  Concept link
    Lamborg, Carl H.  Concept link
    Moran, S. Bradley  Concept link
    Passow, Uta  Concept link
    Roy-Barman, Matthieu  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/1043
    As published
    https://doi.org/10.1016/j.marchem.2005.10.024
    Keyword
     Thorium; Speciation; Seawater; Colloids; Exopolymeric substances; Transparent exopolymeric particles; Amphiphiles; Biosurfactant ligand 
    Abstract
    Since the 1960’s, thorium isotopes occupy a special place in the oceanographer’s toolbox as tracers for determining rates and mechanisms of oceanic scavenging, particle dynamics, and carbon fluxes. Due to their unique and constant production rates from soluble parent nuclides of uranium and radium, their disequilibrium can be used to calculate rates and time scales of sinking particles. In addition, by ratio-ing particulate 234Th (as well, in principle, other Thnuclides) to carbon (and other elements), and linking this ratio to the parent-daughter disequilibrium in the water column, it is possible to calculate fluxes of carbon and other elements. Most of these applications are possible with little knowledge of the dissolved chemical properties of thorium, other than its oxidation state (IV) and tendency to strongly sorb to surfaces, i.e., its “particle- or surface-activity”. However, the use of any tracer is hindered by a lack of knowledge of its chemical properties. Recent observations in the variability of carbon to 234Th ratios in different particle types, as well as of associations of Th(IV) with various marine organic biomolecules has led to the need for a review of current knowledge and what future endeavors should be taken to understand the marine chemistry of thorium.
    Description
    Author Posting. © The Authors, 2006. This is the author's version of the work. It is posted here by permission of Elsevier B.V. for personal use, not for redistribution. The definitive version was published in Marine Chemistry 100 (2006): 250-268, doi:10.1016/j.marchem.2005.10.024.
    Collections
    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Preprint: Santschi, Peter H., Murray, James W., Baskaran, Mark, Benitez-Nelson, Claudia R., Guo, L. D., Hung, C.-C., Lamborg, Carl H., Moran, S. Bradley, Passow, Uta, Roy-Barman, Matthieu, "Thorium speciation in seawater", 2005-07, https://doi.org/10.1016/j.marchem.2005.10.024, https://hdl.handle.net/1912/1043
     

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