The determination of iron by ICP-MS has not been convenient (at ultratrace level in complex matrices) due to polyatomic interferences of different isotopes produced by oxygen, argon and calcium on 56Fe (40Ar16O+ and 40Ca16O+) and 57Fe (40Ca16O1H+, 40Ar16O1H+).
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Segura et al. (2003) studied this question.
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