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Fixation of Iron and Zinc Applied as Chelates Into a Soil Column During Leaching¹

ABSTRACT

The movement of iron in the form of FeEDDHA and FeEDTA and zinc in the form of ZnEDTA was studied in columns of Rehovot sand under several flow rates and in the presence of either Ca(NO₃)₂ or KNO₃ with the same ionic strength of 0.0375M/liter. Chloride was used as a tracer.

FeEDDHA was neither adsorbed nor fixed by the soil. Both ZnEDTA and FeEDTA were fixed in the soil column in the presence of Ca²⁺ but not in the presence of K⁺. ZnEDTA was not adsorbed significantly, whereas FeEDTA was adsorbed in the presence of either KNO₃ or Ca(NO₃)₂ solutions. Reasonable agreement was obtained between experimental results and theoretical calculations of the breakthrough curves, based on the analytical solution of the general dispersion equation.

¹ Contribution from the Department of Soil and Water, the Faculty of Agriculture. The Hebrew University of Jerusalem, Rehovot.

² Acting Head of Dept. Soil & Water Science, and Graduate Student, respectively.

Received for publication July 14, 1975. Accepted for publication July 23, 1975.