File(s) | Type | Description | Action |
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Be-7.csv (3.98 KB) | Comma Separated Values (.csv) | Primary data file for dataset ID 743472 | Add to Cart Download |
A weighted sampling hose, attached to a submersible pump with a portable ctd was deployed over the aft of the ship to collect seawater for Be-7 analysis. The seawater was collected in plastic 700 liter holding tanks and then passed through iron-oxide impregnated acrylic fiber filters (adsorbs Be-7). The efficiency of the fiber for extraction of Be from seawater was determined by adding stable Be atomic absorption standards to a drum containing seawater, pumping the water through an iron fiber cartridge, and at every 100 L measuring the Be content of the cartridge effluent. Based on several trials, it was found that for sample volumes in the range 400-700L, extraction efficiencies are respectively, 82 ± 3% to 76 ± 2%. Some water was also collected from ice occupations, where water was pumped directly through fibers by means of a centrifugal pump on the ice. This was performed in a heated tent. Sample sizes varied from 1-3 fibers, each processing 400-700 L of seawater.
All fibers were returned to the lab where they were dried and ashed. Single fiber samples were pressed into pellets, and the combined ash from multi-fiber samples placed in Marinelli beakers. All samples were then placed over a low background germanium gamma detector. 7Be has a readily identifiable peak at 478keV. The detector is calibrated for these samples by adding a commercially prepared mixed solution of known gamma activities to ashed fiber and counting in the the appropriate geometry.
Please refer to: Kadko & Olson (1996) and Kadko et al. (2016) (full citations below).
Kadko, D. C. (2018) Seawater Beryllium-7 activity concentration from submersible pump samples from USCGC Healy cruise HLY1502 in the Canada and Makarov Basins of the Arctic Ocean from August to October 2015 (US GEOTRACES Arctic). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2018-08-14 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/743472 [access date]
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