Voltammetric determination of iron(II) and iron(III) in standard rocks and other materials |
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Authors: | W Micheal Moore |
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Institution: | The Standard Oil Company (Ohio), 4440 Warrensville Center Road, Cleveland, Ohio 44128 U.S.A. |
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Abstract: | Voltammetry at a rotating platinum electrode in concentrated electrolyte solutions containing HCl and LiCl is described for simultaneous determinations of iron(II) and iron(III) in a variety of materials. Applications of the method to some U.S. Geological Survey standard rocks, a Georgian clay, and an iron-containing multiple vitamin tablet are described. For materials which can be dissolved without altering the original iron(II)/ iron(III) ratio, this method enables the two valence states to be determined rapidly and simultaneously. The technique is precise (r.s.d. ≈ 2%) and relatively free from interference, and requires only a recording d.c. polarograph. |
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