A community-wide intercomparison exercise for the determination of dissolved iron in seawater |
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| Authors: | Andrew R Bowie Eric P Achterberg Peter L Croot Hein JW de Baar Patrick Laan James W Moffett Simon Ussher Paul J Worsfold |
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| Institution: | 1. Antarctic Climate and Ecosystems CRC, Hobart, Tasmania, Australia;2. Australian Centre for Research on Separation Science, University of Tasmania, Hobart, Tasmania, Australia;3. School of Earth, Ocean and Environmental Sciences, University of Plymouth, Plymouth, United Kingdom;4. Royal Netherlands Institute for Sea Research, Texel, The Netherlands;5. Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, USA |
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| Abstract: | The first large-scale international intercomparison of analytical methods for the determination of dissolved iron in seawater was carried out between October 2000 and December 2002. The exercise was conducted as a rigorously “blind” comparison of 7 analytical techniques by 24 international laboratories. The comparison was based on a large volume (700 L), filtered surface seawater sample collected from the South Atlantic Ocean (the “IRONAGES” sample), which was acidified, mixed and bottled at sea. Two 1-L sample bottles were sent to each participant. Integrity and blindness were achieved by having the experiment designed and carried out by a small team, and overseen by an independent data manager. Storage, homogeneity and time-series stability experiments conducted over 2.5 years showed that inter-bottle variability of the IRONAGES sample was good (< 7%), although there was a decrease in iron concentration in the bottles over time (0.8–0.5 nM) before a stable value was observed. This raises questions over the suitability of sample acidification and storage. |
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| Keywords: | Iron Seawater Determination Intercomparison IRONAGES Large volume sample |
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