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The Adsorption of Zinc by Some Soils After Various Pre-extraction Treatments¹

ABSTRACT

The adsorption of zinc by six soils was determined. Soils that formed under slightly acid or neutral conditions usually adsorbed larger quantities of Zn than soils formed under very acid conditions. The stability constants for the soil-zinc systems after displacement of Zn by KCl and Cu(OAc)₂ were also higher for the near neutral soils. Soil from the Ap-horizon was compared to soil from the Al-horizon of the Hoytville soil series. The organic matter content did not explain the differences in the amounts of Zn adsorbed.

The adsorption of Zn by the soils after extraction with hot water or C₆H₆-MeOH were usually slightly less than the non-extracted soil. However, the quantities of Zn adsorbed by the soils after extraction with NaOH were greater than the non-extracted soils. A large percentage of this Zn was not displaced with KCl but was displaced with Cu(OAc)₂.

¹ Contribution from the Department of Agronomy, The Ohio State University, Columbus, Ohio. Presented before Div. S-3, Soil Science Society of America, Kansas City, Mo., Nov. 1964.

² Graduate Assistant, Assistant Professor, and Professor, respectively, The Ohio State University.

Received for publication August 3, 1964. Accepted for publication January 6, 1965.