Spectrophotometric determination of trace amounts of free cyanide in Prussian blue
- 1 January 1979
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in The Analyst
- Vol. 104 (1239) , 525-530
- https://doi.org/10.1039/an9790400525
Abstract
Trace amounts of free cyanide in Prussian blue are hydrolysed into hydrocyanic acid. The latter is captured by a lithium picrate solution contained in a test-tube, which is placed in the reaction vessel. The colour change due to the resulting lithium isopurpurate is measured spectrophotometrically at 500 nm. This method can detect cyanide down to a level of 2.5 µg in 100 mg of Prussian blue and is accurate and reproducible.Keywords
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