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Measurements of Free Zinc²⁺ Activity in Uncontaminated and Contaminated Soils Using Chelation

Dep. of Agronomy, Ohio State Univ., Columbus, OH 43210

W. L. Lindsay

Dep. of Agronomy, Colorado State Univ., Fort Collins, CO 80523

*Corresponding author.

ABSTRACT

Measurement of free Zn²⁺ activity is important for understanding the mechanisms controlling Zn²⁺ solubility in soils. Free uncomplexed Zn²⁺ activities were measured using the chelation method in 12 uncontaminated soils and eight contaminated soils. The measured Zn²⁺ activities ranged from 10^–9.97 to 10^–6.49 M for the uncontaminated soils, and 10^–8.11 to 10^–2.26 M for the contaminated soils. They were inversely related to soil pH, with a correlation coefficient of 0.96 for the uncontaminated soils and 0.89 for the contaminated soils. The measured Zn²⁺ activities and pH for the uncontaminated and contaminated soils can be expressed as log(Zn²⁺) = (5.90 ± 0.24) – 2 pH and log(Zn²⁺) = (9.38 ± 0.74) – 2 pH, respectively. The measured Zn²⁺ activities in the uncontaminated soils were near that of franklinite (ZnFe₂O₄). The measured Zn²⁺ activities in the contaminated soils were close to those of Zn₂SiO₄ or ZnCO₃ depending on the contaminated soils. Different solid phases may control Zn solubility in different soils depending on the sources of contamination and the soil.

Contribution from the Dep. of Agronomy, Colorado State Univ., Fort Collins, CO 80523.

Received for publication July 31, 1992.

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				K. M. Catlett, D. M. Heil, W. L. Lindsay, and M. H. Ebinger Soil Chemical Properties Controlling Zinc2+ Activity in 18 Colorado Soils Soil Sci. Soc. Am. J., July 1, 2002; 66(4): 1182 - 1189. [Abstract] [Full Text] [PDF]