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This article in SSSAJ

  1. Vol. 33 No. 6, p. 976-978
    Received: May 20, 1969
    Accepted: Aug 11, 1969

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Determination of Opal in Soil by Alkali Dissolution Anaylsis1

  1. Robert L. Jones2



Boiling the 20–50 µ fraction of soil for 20 min in 0.5N NaOH and subsequent colorimetric determination of dissolved silica gives results comparable in precision to the liquid density-separation method. The main advantage is economy of time.

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