A review of present techniques and methodological advances in analyzing Th-234 in aquatic systems

MR Van der Loeff*, MM Sarin, M Baskaran, C Benitez-Nelson, KO Buesseler, M Charette, M Dai, O Gustafsson, P Masque, PJ Morris, K Orlandini, ARY Baena, N Savoye, S Schmidt, R Turnewitsch, [No Value] Voge, JT Waples

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

108 Citations (Scopus)

Abstract

The short-lived thorium isotope Th-234 (half-life 24.1 days) has been used as a tracer for a variety of transport processes in aquatic systems. Its use as a tracer of oceanic export via sinking particles has stimulated a rapidly increasing number of studies that require analyses of Th-234 in both marine and freshwater systems. The original Th-234 method is labor intensive. Thus, there has been a quest for simpler techniques that require smaller sample volumes. Here, we review current methodologies in the collection and analysis of Th-234 from the water column, discuss their individual strengths and weaknesses, and provide an outlook on possible further improvements and future challenges. Also included in this review are recommendations on calibration procedures and the production of standard reference materials as well as a flow chart designed to help researchers find the most appropriate Th-234 analytical technique for a specific aquatic regime and known sampling constraints. (c) 2005 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)190-212
Number of pages23
JournalMarine Chemistry
Volume100
Issue number3-4
DOIs
Publication statusPublished - 1 Aug 2006
EventWorkshop on the Future Applications of 234 Th in Aquatic Ecosystems (FATE) - Woods Hole, Morocco
Duration: 1 Aug 2004 → …

Keywords

  • PARTICLE RESIDENCE TIMES
  • export
  • ARCTIC-OCEAN
  • SCAVENGING RATES
  • Th-234
  • ATLANTIC-OCEAN
  • SERIES NUCLIDES
  • THORIUM ISOTOPES
  • GULF-OF-MEXICO
  • methodology
  • ANTHROPOGENIC RADIONUCLIDE DISTRIBUTIONS
  • sampling
  • analytical techniques
  • ARABIAN SEA
  • PARTICULATE ORGANIC-CARBON

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