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Optimised Ferrozine Micro‐Method for the Determination of Ferrous and Ferric Iron in Rocks and Minerals |
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| Authors: | John Husler Elizabeth DA Ferriss Katheryn B Helean Charles R Bryan Patrick V Brady |
| Institution: | 1. 5901 Los Riscos Rd. NW, Albuquerque, NM 87120, USA;2. Department of Geological Sciences, University of Michigan, 2534 C. C. Little Building, 1100 North University Ave, Ann Arbor, MI 48109‐1005, USA;3. Sandia National Laboratories, P.O. Box 5600 MS 0776, Albuquerque, NM 87185‐0776, USA |
| Abstract: | The ferrozine wet chemical method was optimised for the determination of the total iron content and speciation in small geological samples. The ferrozine micro‐method involves dissolution by a mixture of HF and H2SO4 followed by spectrophotometric analysis using the complexing agent ferrozine. The method was tested for twenty‐one replicates of eight rock RMs using test portions of 5–14 mg and containing 0.37–5.45 mg total Fe and more than 0.29 mg Fe(II). The optimised ferrozine method was accurate to within 0.23% m/m FeO and 0.34% m/m total Fe, which compares favourably to other wet chemical methods. |
| Keywords: | ferrozine iron speciation ferrous ferric rock analysis mineral analysis ferrozine spé ciation de fer ferreux ferrique analyse de roches analyse de miné raux |