An intercomparison exercise for trace metal monitoring in oxygen-rich and anoxic Baltic waters |
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| Authors: | C Pohl D Schmidt K Nagel P Freimann U Hennings A Jacobsen U Michel A Neubauer-Ziebarth A Schulz |
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| Institution: | Institut für Ostseeforschung an der Universit?t Rostock, Seestrasse 15, 18119 Warnemünde, Germany e-mail: christa.pohl@io-warnemuende.de Tel.: +49-381-5197321 Fax: +49-381-5197440, DE
Bundesamt für Seeschifffahrt und Hydographie, 20305 Hamburg, P.O. Box 301220, Germany, DE
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| Abstract: | Seawater samples for a laboratory intercomparison of trace metal concentrations (Mn, Fe, Ni, Cu, Cd, Pb) in the dissolved
(<0.4 μm filtered) and particle-bound phases as well as total and reactive Hg were collected in the Gotland Basin, a region
in the Baltic Sea with trace metal gradients in the halocline and the redox boundary. Two laboratories took part in this exercise,
each laboratory analysing samples from two vertical profiles collected using ”clean” sampling techniques. The hydrographic
and hydrochemical situation was determined to characterise the water column and help interpret the results. An estimation
of the conformity of the two laboratories was performed by comparing the results with international intercalibration exercises
and certified reference materials. For all metals the characteristic vertical distribution and the concentration range of
the data were comparable to other results published for the region. The concentration differences in the amount contents of
Mn, Fe, Ni, Cu, Cd, Pb and Hg determined between both laboratories were better than the confidence intervals given by an ICES
(International Council for the Exploration of the Sea) international comparison exercise for Baltic waters. Differences for
Ni in the anoxic water body are attributed to the sulphidic matrix and their influence on the different methods used by the
laboratories. For Pb and Hg the concentrations were near the detection limit of our methods, low level contamination was possibly
responsible for the concentration differences. Small differences for dissolved Mn were attributed to different sampling techniques.
We conclude that sampling and sample handling are still weak links in the trace metal analysis of anoxic seawater and that
the analytical methods we used for this exercise are satisfactory for the accurate determination of Cd, Cu, Pb, Mn, Fe, and
also for studying biogeochemical cycling of these trace metals in oxygen-rich and anoxic water bodies.
Received: 8 February 2001 Accepted: 8 August 2001 |
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| Keywords: | Intercomparison exercise Trace metals Baltic Sea Anoxic seawaters |
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