Charette, Matthew A., Dulaiova, Henrieta, Gonneea, Meagan E., Henderson, Paul B., Moore, Willard S., Scholten, Jan and Pham, M.K. (2012) GEOTRACES radium isotopes interlaboratory comparison experiment. Limnology and Oceanography: Methods, 10 (6). pp. 451-463. DOI 10.4319/lom.2012.10.451.

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Abstract

In anticipation of the international GEOTRACES program, which will study the global marine biogeochemistry of trace elements and isotopes, we conducted a multi-lab intercomparison for radium isotopes. The intercomparison was in two parts involving the distribution of: (1) samples collected from four marine environments (open ocean, continental slope, shelf, and estuary) and (2) a suite of four reference materials prepared with isotopic standards (circulated to participants as 'unknowns'). Most labs performed well with Ra-228 and Ra-224 determination, however, there were a number of participants that reported Ra-226, Ra-223, and Th-228 (supported Ra-224) well outside the 95% confidence interval. Many outliers were suspected to be a result of poorly calibrated detectors, though other method specific factors likely played a role (e. g., detector leakage, insufficient equilibration). Most methods for radium analysis in seawater involve a MnO2 fiber column preconcentration step; as such, we evaluated the extraction efficiency of this procedure and found that it ranged from an average of 87% to 94% for the four stations. Hence, nonquantitative radium recovery from seawater samples may also have played a role in lab-to-lab variability.

Document Type:	Article
Research affiliation:	Kiel University Kiel University > Kiel Marine Science OceanRep > The Future Ocean - Cluster of Excellence
Refereed:	Yes
Open Access Journal?:	No
Publisher:	John Wiley & Sons: Blackwell Publishing
Projects:	Future Ocean
Date Deposited:	29 Mar 2018 11:04
Last Modified:	23 Sep 2019 23:56
URI:	https://oceanrep.geomar.de/id/eprint/42542

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