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A Dual-Buffer Titration Method for Lime Requirement of Acid Minesoils

Dep. of Plant & Soil Sci., The Univ. of Vermont, Hills Building, Burlington, VT 05405-0082 (formerly The Pennsylvania State Univ., University Park);

D. E. Baker and L. H. McCormick

The Pennsylvania State Univ., University Park, PA 16802.

^* Corresponding author.

ABSTRACT

A lime requirement test termed the dual-buffer titration (DBT) was developed for acid minesoils occurring in Pennsylvania. The DBT uses two buffers to stoichiometrically account for contributions of hydrogen ions (H⁺) to soil acidity to pH 7.0, including those from the hydrolysis of Al. The first buffer lowers the soil pH to 3.17 to dissolve Al-OH polymers, amorphous coatings, and interlayer species. The second buffer raises the pH to approximately 8.2, titrating the exchangeable Al³⁺ and other hydrolyzed species to neutralized forms. Lastly, a titration of the buffers-soil mixture with standardized base to pH 8.2 provides a direct measure of the lime requirement. For comparison, a 5-month CaCO₃ incubation of 31 soils was also determined. The results by the two methods were highly correlated (r = 0.92) for 24 samples and statistically the same at a probability level of 0.001.

Contribution from The Pennsylvania Agric. Exp. Stn., University Park, PA 16802. Authorized for publication on 14 Apr. 1987 as Paper no. 7652 in the Journal Series.

Received for publication May 12, 1987.