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Estimation of Isotopically Exchangeable Cadmium and Zinc in Soils¹

ABSTRACT

Isotopically exchangeable and chelate-extractable Cd and Zn (16-h equilibrations) were compared for a silt loam and a loamy sand with and without addition of 51 kg m^–3 of sewage sludge. The chelating agents used were 5 mM DTPA (diethylenetriaminepentaacetic acid) at a soil to solution ratio of 1:5 and 5 and 1 mM EDTA (ethylenediaminetetraacetic acid) at soil to solution ratios of 1:5 and 1:2.5. The extractant best suited to estimate isotopically exchangeable Cd and Zn in the soils studied was 5 mM EDTA at a soil to solution ratio of 1:2.5. Extractions with this sulution ranged from 87 to 114% of the Cd isotopically exchangeable in 16 h and 91 to 113% of the Zn isotopically exchangeable in the two soils with and without sludge addition.

¹ Research supported by the College of Agricultural and Life Sciences, Univ. of Wisconsin-Madison, and by EPA Grant CR807270010.

² Research Assistant and Professor, Dep. of Soil Sci., Univ. of Wisconsin-Madison, Madison, WI 53706. Senior author presently Chemist, U. S. Geological Survey, Sacramento, CA 95825.

Received for publication April 29, 1985.

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