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Agronomy Journal Abstract -

Evaluation of the Orion Cyanide Electrode for Estimating the Cyanide Content of Forage Samples.


This article in AJ

  1. Vol. 61 No. 5, p. 717-718
    Received: Jan 13, 1969

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  1. J. T. Gillingham,
  2. M. M. Shirer and
  3. N. R. Page2



The Orion cyanide electrode was evaluated for estimating the cyanide content of forages, by comparison to the colorimetric alkaline picrate method. The two methods were highly correlated (r = +0.956). The Orion electrode was found to overestimate the cyanide content of the forage by about 40%. The overestimation can be corrected with the regression equation, Y = −4 + 1.43 X where X and Y are colorimetrlc and potentiometric values, respectively. The logarithmic response of the electrode precludes discrimination between plant samples until the CN concentration difference exceeds ± 15% approximately. The electrode method was found to be simple, rapid, and reproducible and well suited for screening purposes.

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