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Selective extraction of amorphous iron oxides by EDTA from selected silicates and mixtures of amorphous and crystallline iron oxides

Published online by Cambridge University Press:  09 July 2018

O.K. Borggaard
O.K. Borggaard*
Affiliation:
Royal Veterinary and Agricultural University, Chemistry Department, Thorvaldsensvej 40, DK-1871 Copenhagen V, Denmark
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Extract

Amorphous iron oxides in soil are often extracted by an ammonium oxalate solution (Schwertmann, 1964). This treatment may, however, also dissolve crystalline iron oxides and iron silicates (McKeague & Day, 1966; Baril & Bitton, 1969; McKeague et al., 1971; Arshad et al., 1972; Pawluk, 1972; Schwertmann, 1973; Taylor & Schwertmann, 1974; Borggaard, 1976).

It has been shown that EDTA can selectively extract amorphous iron oxides from soils (Borggaard, 1979, 1981) and a synthetic mixture of amorphous iron oxide, goethite, and hematite (Borggaard, 1976). As pointed out previously (Borggaard, 1979), the EDTA method should also be tested on selected minerals to decide if it can serve as a reference method against which other less time-consuming methods may be tested.

Type
Notes
Information
Clay Minerals , Volume 17 , Issue 3 , September 1982 , pp. 365 - 368
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1982

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References

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