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Revised Method for the Preparation of Standards in the Sodium Picrate Assay of HCN¹

The proposed revised sodium picrate assay method relies on recovery rather than solution standards. The recovery standards are prepared by releasing HCN from stock cyanide solutions, recovering the HCN on alkaline picrate paper strips, followed by elution in distilled H₂O.

² Research Assistants and Professor of Plant Breeding, University of Illinois, Urbana. The senior author is presently a research assistant at the University of Nebraska, Lincoln.

Received for publication December 3, 1966.