Abstract
THE neutral citrate-dithionite reagent of Aguilera and Jackson1 is used widely to remove iron oxides from soils and soil clays prior to mineralogical analysis. It is also employed in a scheme for the fractionation of soil phosphorus2, where it is used for extracting iron-bound, but not aluminium-bound, phosphorus occluded by secondary iron oxides. This communication describes a method for determining aluminium extracted from soils by this reagent and reports the amounts of aluminium extracted from an aluminium oxide, an aluminium phosphate, and some New Zealand soils. The oxide was prepared by adding ammonium to a solution of aluminium chloride and dialysing the precipitate until free of soluble salts; the hydrous oxide had been air-dried and stored for 2 years. The phosphate, a B.D.H. laboratory reagent, was washed with water until water-soluble phosphorus was reduced to 0.25 per cent
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References
Aguilera, N. H., and Jackson, M. L., Soil Sci. Soc. Amer. Proc., 17, 359 (1953).
Chang, and Jackson, M. L., Soil Sci., 84, 133 (1957).
Longuyon, J. G. de., Ber. Deutsch. Keram. Ges., 35, 155 (1958).
Cimerman, Ch., Alon, A., and Mashall, J., Talanta, 1, 314 (1958).
Yuan, T. L., and Fiskell, J. G. A., Soil Sci. Soc. Amer. Proc., 23, 202 (1959).
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SAUNDERS, W. Aluminium extracted by Neutral Citrate-Dithionite Reagent. Nature 184, 2037 (1959). https://doi.org/10.1038/1842037a0
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DOI: https://doi.org/10.1038/1842037a0
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