Hostname: page-component-848d4c4894-8bljj Total loading time: 0 Render date: 2024-06-25T01:53:27.993Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access Rights & Permissions [Opens in a new window]

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Arshad, M.A., St.Arnaud, R.J. & Huang, P.M. (1972) Dissolution of trioctahedral layer silicates by ammonium oxalate, sodium dithionite-citrate-bicarbonate, and potassium pyrophosphate. Can. J. Soil Sci. 52, 19–26.Google Scholar
Baril, R. & Bitton, G. (1969) Teneurs elevees de fer libre et identification taxonomique de certains sols du Quebec contenant de la magnetite. Can. J. Soil Sci. 49, 1–9.Google Scholar
Borggaard, O.K. (1976) Selective extraction of amorphous iron oxide by EDTA from a mixture of amorphous iron oxide, goethite, and hematite. J. Soil Sci. 27, 478–486.Google Scholar
Borggaard, O.K. (1979) Selective extraction of amorphous iron oxides by EDTA from a Danish sandy loam. J. Soil Sci. 30, 727–734.Google Scholar
Borggaard, O.K. (1981) Selective extraction of amorphous iron oxides by EDTA from soils from Denmark and Tanzania. J. Soil Sci. 32, 427-432.Google Scholar
Christensson, F. & Jensen, E. (1970) The mineralogical composition of the pyrite-bearing lignite clay from Southwest Jutland. Kgl. Vet.- og Landbohejsk. Arsskr. 123–139.Google Scholar
Kerr, P.F. (1951) Reference Clay Minerals. American Petroleum Institute Research Project 49. Columbia University, New York.Google Scholar
McKeague, J.A., Brydon, J.E. & Miles, N.M. (1971) Differentiation of forms of extractable iron and aluminium in soils. Proc. Soil Sci. Soc. Am. 35, 33–38.CrossRefGoogle Scholar
McKeague, J.A. & Day, J.H. (1966) Dithionite- and oxalate-extractable Fe and Al as aids in differentiating various classes of soils. Can. J. Soil Sci. 46, 13–22.CrossRefGoogle Scholar
Pawluk, S. (1972) Measurement of crystalline and amorphous iron removal in soils. Can. J. Soil Sci. 52, 119–123.Google Scholar
Schwertmann, U. (1964) Differenzierung der Eisenoxide des Bodens durch Extraktion mit Ammoniumoxalat- Losung. Z. Pflanzenern. Dung. Bodenk. 105, 194–202.Google Scholar
Schwertmann, U. (1973) Use of oxalate for Fe extraction from soils. Can. J. Soil Sci. 53, 244–246.CrossRefGoogle Scholar
Taylor, R.M. & Schwertmann, U. (1974) Maghemite in soils and its origin: I. Properties and observations on soil maghemites. Clay Miner. 10, 289–298.Google Scholar