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

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.

Key Words: Cyanide electrode • Sudangrass • Sorghum-sudangrass Hybrids • Cyanide estimation

² Assistant Chemist, Chemistry Assistant, and Head, Department of Agricultural Chemical Services, Clemson University, Clemson, S. C. 29631.

Received for publication January 13, 1969.