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Soil Science Society of America Journal Abstract -

Fractionation of Copper in Neutron Activated Soils1


This article in SSSAJ

  1. Vol. 30 No. 2, p. 188-192
    Received: June 28, 1965
    Accepted: Jan 3, 1966

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  1. J. R. Kline and
  2. R. H. Rust2



Copper in surface and subsurface horizons of six soils was fractionated by chemical methods after irradiation of the samples with thermal neutrons. The first fraction was obtained by a process of self diffusion in which soil Cu was allowed to diffuse into dilute CuSO4 solutions. The second was obtained by extracting the soils in hot solutions of dilute CuSO4 which were 0.1M in HCl after removal of the diffusible Cu. The third consisted of the residual Cu after the first two increments had been removed. Determinations were done using a 400 channel gamma ray spectrometer. From 35 to 70% of the total Cu in these soils was found to be freely diffusible. Self diffusion took place as readily in calcareous soils as in noncalcareous soils. Extractions in 0.5M NaOH released amounts of Cu similar to those released by diffusion which suggests that much of the freely diffusible Cu is of organic origin. Copper released by acidic CuSO4 ranged from 20 to 40% of the total and residual Cu ranged from 4 to 40% of the total.

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