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This article in SSSAJ

  1. Vol. 34 No. 1, p. 38-44
    Received: Apr 11, 1969
    Accepted: Sept 23, 1969

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Titration of Acid Soils1

  1. H. C. Dewan and
  2. C. I. Rich2



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.

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