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High-accuracy determination of iron in seawater by isotope dilution multiple collector inductively coupled plasma mass spectrometry (ID-MC-ICP-MS) using nitrilotriacetic acid chelating resin for pre-concentration and matrix separation

Jeroen J de Jong, Véronique V Schoemann, Delphine D Lannuzel, Jean-Louis JL Tison, and Nadine N Mattielli

Anal Chim Acta 623(2):14 (2008) PMID 18620916

In the present paper we describe a robust and simple method to measure dissolved iron (DFe) concentrations in seawater down to 2, and acidified (pH 1.9) ultra-high purity (UHP) water. We measured SAFe (sampling and analysis of Fe) reference seawater samples Surface-1 (0.097+/-0.043nmolL^-^1) and Deep-2 (0.91+/-0.17nmolL^-^1) and obtained results that were in excellent agreement with their DFe consensus values: 0.118+/-0.028nmolL^-^1 (n=7) for Surface-1 and 0.932+/-0.059nmolL^-^1 (n=9) for Deep-2. We also present a vertical DFe profile from the western Weddell Sea collected during the Ice Station Polarstern (ISPOL) ice drift experiment (ANT XXII-2, RV Polarstern) in November 2004-January 2005. The profile shows near-surface DFe concentrations of ~0.6nmolL^-^1 and bottom water enrichment up to 23nmolL^-^1 DFe.

DOI: 10.1016/j.aca.2008.06.013
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