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This article in SSSAJ

  1. Vol. 34 No. 1, p. 38-44
     
    Received: Apr 11, 1969
    Published: Jan, 1970


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doi:10.2136/sssaj1970.03615995003400010015x

Titration of Acid Soils1

  1. H. C. Dewan and
  2. C. I. Rich2

Abstract

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.

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