SSSAJ Journal of Natural Resources and Life Sciences Education
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Published in Soil Sci Soc Am J 20:334-337 (1956)
© 1956 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Infrared Absorption Evidence on Exchange Reaction Mechanism of Copper and Zinc with Layer Silicate Clays and Peat1

L. E. DeMumbrum and M. L. Jackson2

ABSTRACT

The degree to which cations which form weak bases are sorbed in excess of cations which form strong bases is shown to be about 10% in montmorillonite and 40% in peat. These excesses were accounted for by a special reaction mechanism which was revealed when layer silicate clays or peat fractions were examined by an infrared absorption technique. Copper and zinc saturation decreased the 2.8 micron hydroxyl absorption intensity of montmorillonite, vermiculite, and kaolinite, indicating a reaction with octahedral OH in the layer silicates. The larger OH peak of kaolinite at 2.7 microns was not affected. Also, the copper treatment yielded an additional pair of absorption peaks at 6.4 and 7.0 microns. Aluminum and iron treatment tended to increase the 2.8 micron peak slightly. Copper and zinc saturation of peat fractions resulted in numerous shifts in the double bond region of the spectrum, which were indicative of chelation with C = O and N = O groups.

NOTES

1 Presented before Div. II, Soil Science Society of America, Davis, Calif., Aug. 18, 1955. Received April 4, 1955. A portion of a Ph.D. thesis submitted at the University of Wisconsin by the first author and supported in part by grants from the Wisconsin Alumni Research Foundation and the National Science Foundation.

2 Research Fellow and Professor of Soils, respectively.






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