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Effects of Different Aqueous Buffers on the Zinc Extractability of Dithizone¹

ABSTRACT

The effect of several aqueous buffers on the Zn extractability of dithizone was examined on three Minnesota soils: Zimmerman s, Brainerd sl, and Blue Earth sicl. The five aqueous solutions used with dithizone were water, 1N NH₄OAc, 1N NaOAc, 1N Ba(OAc)₂, and 1N Ca(OAc)₂. Dithizone-1N NH₄OAc extracted the greatest amounts of Zn and dithizone-water extracted the least. The data indicated that the variation in dithizone extractable Zn with different buffers may be related to the buffering capacity of the aqueous solutions, the NH₄ ion, and the soil organic matter present.

¹ Contribution from Dept. of Soil Science, Univ. of Minnesota, Paper no. 7014 Scientific Journal Series, Minn. Agr. Exp. Sta.

² Graduate Research Asst., Associate Professor, and Professor of Soil Science, respectively, Univ. of Minnesota.

Received for publication August 22, 1969. Accepted for publication March 31, 1970.