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An Evaluation of Zonal Centrifugation as a Research Tool in Soil Science: II. Characterization of Soil Clays¹

ABSTRACT

Data revealed little resolution in banding is gained in centrifuging for 40 compared to 17 hours in a conventional centrifuge (force field less than 623 x g). On the other hand, the resolution obtained by centrifuging in an ultracentrifuge is considerably better than that obtained in a conventional refrigerated centrifuge. The clay fraction from a Dodge silt loam banded into nine fractions after centrifuging at 15,000 rpm (38,500 x g) for 17 hours. Characterization of each band allowed a much more extensive evaluation as to the quantities of each specific clay mineral present than the conventional estimates presently being made by examining X-ray diffractograms of the total clay fractions.

¹ Research sponsored by the US Atomic Energy Commission under contract with the Union Carbide Corp.

² Senior staff scientists, Ecological Sciences and Health Physics Division, respectively, Oak Ridge National Lab., Oak Ridge, Tenn. 37830.

Received for publication July 16, 1971. Accepted for publication December 22, 1971.