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This article in SSSAJ

  1. Vol. 21 No. 2, p. 160-162
    Received: Aug 31, 1956
    Accepted: Oct 9, 1956

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The Determination of Polyuronides in Soils with Carbazole1

  1. D. L. Lynch,
  2. E. E. Hearns and
  3. L. J. Cotnoir Jr.2



A method is described for the determination of uronic acids in soil organic matter using a colorimetric method in which a complex is formed with carbazole. Ferric iron interferes in this procedure in amounts over 20 ppm. This interference may be removed by reducing the iron with stannous chloride. This method is rapid and reproducible and can be readily used to follow the rapid breakdown and production of polyuronides in soils. Data showing results obtained with this method are included.

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