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Titration of Acid Soils¹

ABSTRACT

Seven acid soils containing varied cation exchange materials were studied by means of conductometric and potentiometric titrations with Ba(OH)₂, NaOH, Na₂B₄O₇, and NaOAc, and extractions with KCl, NH₄OAc (pH 4.8), and BaCl₂-triethanolamine (pH 8.3).

Generally consistent results were obtained when the aluminate reaction was considered for titrations with strong bases. The extent of the aluminate reaction for exchangeable interlayer Al³⁺ apparently depends on the exchange of Al³⁺ by the base. Thus, the low values in conductometric titrations with NaOH compared to Ba(OH)₂ are explained on the basis of the poorer exchange of Al³⁺ by Na⁺.

Titrations with NaOAc indicate that only a cat clay soil contained strong acid type exchangeable H⁺, although four of the other soils contained about 20 meq/100g of Al³⁺ exchangeable by KCl.

¹ Contribution from the Agronomy Department, Virginia Polytechnic Inst., Blacksburg.

² Former Graduate Assistant (presently Soil Chemist, FAO, Korea Soil Survey Project, P.O. Box 12, Suwon, Korea) and Professor of Agronomy, respectively. The authors thank the V.P.I. Soil Survey personnel for assistance in obtaining soil samples.

Received for publication April 11, 1969. Accepted for publication September 23, 1969.