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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/25349

Title: Thorium speciation in seawater
Authors: P.H. Santschi;J.W. Murray;M. Baskaran;C.R. Benitez-Nelson;L.D. Guo;C.-C. Hung;C. Lamborg;S.B. Moran;U. Passow;M. Roy-Barman
Contributors: NTOU:Institute of Marine Environmental Chemistry and Ecology
Keywords: Thorium;Speciation;Seawater;Colloids;Exopolymeric substances;Transparent exopolymeric particles;Amphiphiles;Biosurfactant ligand
Date: 2006-08-01
Issue Date: 2011-10-20T08:22:21Z
Publisher: Marine Chemistry
Abstract: abstract:Since the 1960s, 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 Th-nuclides) 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.
Relation: 100(3-4), pp.250–268
URI: http://ntour.ntou.edu.tw/handle/987654321/25349
Appears in Collections:[海洋環境與生態研究所] 期刊論文

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