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This article in SSSAJ

  1. Vol. 22 No. 6, p. 500-502
     
    Received: Apr 22, 1958
    Published: Nov, 1958


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doi:10.2136/sssaj1958.03615995002200060006x

A Rapid Field and Laboratory Procedure for Determining the Sodium Content of Soil1

  1. R. P. Matelski and
  2. C. H. Yien2

Abstract

Abstract

Rapid, field or laboratory, semiquantitative fluorometric methods for determining the exchangeable and soluble sodium contents in soils have been developed. Determinations on alkali soils can be completed in 15 minutes or less. The basis for the methods is the development of a green-yellow fluorescence upon addition of a uranyl zinc acetate solution to the soil or the water extract of the soil. The rate and intensity of fluorescence is measured using commercially available portable fluorescent equipment. Fluctuations in organic matter content, salt content, pH, and texture on the sodium content were without apparent effect. Potassium and phosphorus also do not interfere with the fluorescent determination of sodium.

Numerous soils ranging in exchangeable and soluble sodium contents from 0.1 to 18.1 and from 0.1 to 9.7 me. per 100 g. soil, respectively, were examined. These soils represented wide ranges of physical and chemical properties.

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