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Contributions of Fixed Charge and Mobile Complexing Agents to the Diffusion of Zinc¹

ABSTRACT

Zinc was allowed to diffuse from a ZnCO₃ precipitate through an agar-agar gel to a stream of continuously flowing water. In one treatment, part of the agar-agar was replaced by Ca-poly-galacturonate to incorporate fixed negative charges in the gel in the form of carboxyl groups. In a second treatment, Cacitrate was introduced into the flowing stream of water. In every case, all phases of the system were kept in equilibrium with CaCO₃.

Both fixed charges and the mobile complexing agent increased the transport of Zn in the system, but the latter was considerably more effective than the former. One percent polygalacturonic acid increased the transport of Zn by 13%, whereas 2 x 10^-3 M citrate increased the transport of Zn 100-fold.

Results compare favorably with a theoretical treatment for the contribution of the mobile complexing agents to Zn transport.

¹ Contribution from Soil and Water Conserv. Res. Div., ARS, USDA, Ithaca, N. Y., and Fort Collins, Colo., and Dep. of Agronomy, Colorado State Univ., Fort Collins. Published with the approval of the Director of the Colorado Agr. Exp. Sta. as Scientific Series Paper no. 1201.

² Soil Scientist, USDA, Associate Professor, Cornell Univ., and Faculty Affiliate, Colorado State Univ.; Associate Professor, Colorado State Univ.; and Soil Scientist, USDA, and Agronomist, Colorado State Univ.; respectively.

Received for publication November 2, 1966. Accepted for publication January 6, 1967.