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Effect of Hydrochloric Acid-Hydrogen Fluoride Pretreatments on Solubilization of Organic Matter by a Cation-Exchange Resin¹

ABSTRACT

Soil was pretreated with HCl-HF solutions prior to organic matter solubilization by an iminodiacetic acid type cation-exchange resin (Chelex 100). As the normality of HCl-HF solutions increased from 0.05N to 0.5N, the identifiable soil mineral content of the extracted organic matter decreased and the inorganic element content increased. Pretreatments with 0.1N and 0.3N HCl-0.3N HF solutions resulted in the highest element concentrations in the extracted organic matter, while the 0.5N HCl-0.5N HF pretreatment resulted in the smallest soil mineral content. Elemental analysis of the ashed organic matter indicated that it had a high affinity for P, Al, Fe, Zn, Cu, and B solubilized by HCl-HF. Infrared spectra of the extracted material suggested that metal-organic complexing occurred through electrovalent bonding between ionized carboxyl groups and solubilized inorganic elements and their hydrous oxides. However, analysis of the supernatant from the HCl-HF pretreatments indicated that most of the solubilized soil elements remained in solution.

¹ Contribution from Dep. of Soil Science, Univ. of Minn., St. Paul, 55101. Paper no. 8433, Scientific Journal Series, Minn. Agr. Exp. Sta. Part of senior author's Ph.D. dissertation. Presented before a joint meeting of Div. S-2 and Div. S-3, Soil Sci. Soc. of Amer., at New York, N.Y. 17 Aug. 1971.

² Formerly Graduate Research Assistant and Associate Professor of Soils. Present address of senior author, The Metropolitan Sanitary District of Greater Chicago, Canton, Ill.

Received for publication October 8, 1973. Accepted for publication May 9, 1974.