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Behavior of Chromium in Soils: I. Trivalent Forms¹

ABSTRACT

Chemical behavior of Cr(III) was studied in solutions, soil suspensions, and in soils of contrasting characteristics incubated at field capacity moisture. Sodium pyrophosphate, pH 4.8 NH₄OAc, and 0.1M NaF appeared to extract organically bound Cr(III), whereas 1M HCl removed inorganic Cr hydroxides and phosphates along with some organic Cr. Pyrophosphate and HCl extracts represented quantities of Cr(III) removed; NH₄OAc and NaF extracts appeared to characterize small readily removed fractions, that is, intensity factors.

Soil organic complexes of Cr(III) formed at low pH and appeared to remain stable and soluble even when soil pH's were raised to levels where the Cr would be expected to precipitate. Adsorption and solubility behavior of Cr(III) as it varied with pH and treatments was similar to that of Al.

Oxidation of Cr(III) to Cr(VI) was not demonstrated at all, under conditions of maximum aeration and high pH.

Key Words: extractable Al • extractable Cr • organic complexing of Cr • oxidation of Cr • phosphorus and Cr solubility • pH and Cr solubility

¹ Vermont Agric. Exp. Stn. J. Article No. 350. Part of the thesis submitted by the junior author for the Ph.D. degree, Univ. of Vermont, 1974.

² Professor and former Graduate Research Fellow, respectively, Dep. of Plant and Soil Sci., Univ. of Vermont and Vermont Agric. Exp. Stn., Burlington, VT 05401. Junior author is with the USDA Soil Conserv. Serv., Douglas, Wyo.

Received for publication November 3, 1975.

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