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Interactions of Hydrazine with Clays and Soils

Dep. of Soil Science, Univ. of Florida, Gainesville, FL 32611.

^* Corresponding author.

ABSTRACT

The nature and extent of hydrazine adsorption by clays and soils was found to be highly dependent on the suspension pH and on the types of surface functional groups. Under acidic conditions, replacement of Na⁺ by N₂H⁺₅ was the primary mechanism for hydrazine retention by every system studied. Most of the hydrazinium ion was readily desorbed by K⁺ from the surfaces of reference clays under acidic conditions, but remained absorbed on the surfaces of the Arredondo soil (Grossarenic Paleudults) horizons investigated. Under alkaline conditions, ion exchange was the predominant mechanism for hydrazine retention only in the case of montmorillonitic smectite. Kaolinite and two of the upper horizons of Arredondo soil adsorbed hydrazine via a different mechanism. Hydrazine retained on exchange sites was readily desorbed by K⁺.

Partial financial support was provided by Contract no. F08635-83-C-0136 from the U.S. Air Force. Florida Agric. Exp. Stn. Journal Series no. 9886.

Received for publication December 19, 1988.

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