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    Adsorbers for in-situ collection and at-sea gamma analysis of dissolved Thorium-234 in seawater

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    WHOI-94-15.pdf (876.9Kb)
    Date
    1994-07
    Author
    Hartman, M. C.  Concept link
    Buesseler, Ken O.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/589
    DOI
    10.1575/1912/589
    Keyword
     Thorium-234; Mn02 adsorber; seawater; Cape Hatteras (Ship) Cruise; Malcolm Baldridge (Ship) Cruise; Discoverer (Ship) Cruise 
    Abstract
    Two polypropylene cartridge types (Beta Pure and Hytrex II) were tested in the laboratory as adsorbers for in-situ collection of dissolved Thorium-234 (234TH) in seawater. Using a uranyl nitrate tracer, we determined that a Mn02 impregnated 3.25-inch Hytrex II cartridge with a flow rate of 8 liters/minute would collect 234TH with a greater than 60% effciency. The smaller size and composition of the 3.25 inch Hytrex II cartridge enabled it to be pressed into a permanent 1-inch "puck" for direct gamma counting. This protocol significantly reduced the handling between collection and counting. When field tested in the Gulf of Maine as a large volume (>500 liters) collector, the new adsorbers produced a greater than 80% collection effciency and a dissolved 234TH concentration which was consistent with independent samples collected at the same station and depth. These adsorbers were used successfully for the in-situ collection of 234TH in large volumes of seawater during the 1992 NOAA and NSF sponsored JGOFS EqPac program, with a mean collection efficiency of 0.79 +/- 9% (n=104 cartridge pairs).
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    • Marine Chemistry and Geochemistry (MC&G)
    • WHOI Technical Reports
    Suggested Citation
    Technical Report: Hartman, M. C., Buesseler, Ken O., "Adsorbers for in-situ collection and at-sea gamma analysis of dissolved Thorium-234 in seawater", 1994-07, DOI:10.1575/1912/589, https://hdl.handle.net/1912/589
     

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