3957 13 archive 337 disk0/00/00/39/57 2008-04-07 14:14:44 2008-07-18 10:47:33 2008-07-16 17:03:32 article show Andrew.Bowie@utas.edu.au Bowie AR Andrew.Bowie@utas.edu.au Ussher SJ Landing WM Worsfold PJ pub 040502 260402 961104 770304 restricted biogeochemistry, environmental cycles, iron, seawater analysis. Copyright © 2007 CSIRO. category => A1 categoryDesc => Refereed Article in a Scholarly Journal eprintID => 0 field1 => Environ.Chem. field10 => field11 => field12 => field13 => field2 => Australia field3 => 4 field4 => 1 field5 => 1-Apr field6 => CSIRO field7 => 1448-2517 field8 => field9 => funding => Q grant => lastUpdate => 13/09/2007 rfcd => 260402 seo => 770304 themeArea => EW title => Intercomparison between FI-CL and ICP-MS for the determination of dissolved iron in Atlantic seawater tor => AR uid => 47363 update => no Results from a 3-laboratory blind intercomparison exercise with two widely used analytical methods for the determination of iron in seawater are presented. The two methods used are coprecipitation followed by isotope dilution inductively coupled plasma mass spectrometry (ICP-MS) and chemical reduction to iron(ii) followed by flow injection with chemiluminescence detection (FI-CL). The five samples used were collected from the South Atlantic Ocean as part of the IRONAGES intercomparison exercise. To avoid any inter-bottle variability, the same sample bottles were sent sequentially to three laboratories in England, Australia and the United States over a 12-month period. The results show that there is no statistical difference (P =0.05) between the shipboard FI-CL method and the directly traceable, low blank, isotope dilution ICP-MS method for the determination of iron in surface South Atlantic seawater. There was also excellent agreement between the overall mean of the three laboratories (0.54±0.03 nM) and the consensus value from an earlier community-wide separate bottle intercomparison using the same IRONAGES sample water (0.59±0.21 nM). 2007 published Environmental Chemistry 4 1 CSIRO 1-Apr 10.1071/EN06073 TRUE 1448-2517 http://dx.doi.org/10.1071/EN06073 4761 4 3957 1 application/pdf en staffonly cc_utas

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