A community-wide intercomparison exercise for the determination of dissolved iron in seawater

A.R. Bowie, E.P. Achterberg, P.l. Croot, H.J.W. de Baar, P. Laan, J.W Moffett, S. Ussher, P.J. Worsfold

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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 (
Original languageEnglish
Pages (from-to)81-99
Number of pages19
JournalMarine Chemistry
Issue number1
Publication statusPublished - 2006


  • Large volume sample
  • Intercomparison
  • Determination
  • Seawater
  • Iron

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