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The colorimetric determination of cyanide in human food and animal feed

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Author: Eeden, C.H. van · Jong, A.W.J. de
Institution: Centraal Instituut voor Voedingsonderzoek TNO
Source:Zeitschrift für Lebensmittel-Untersuchung und -Forschung, 5, 181, 412-416
Identifier: 229875
doi: doi:10.1007/BF01027409
Keywords: Cyanide · Dyes, reagents, indicators, markers and buffers · Animal · Animal food · Article · Drug stability · Food analysis · Human · Legume · Medicinal plant · Spectrophotometry · Time · Animal · Animal Feed · Cyanides · Drug Stability · Fabaceae · Food Analysis · Human · Indicators and Reagents · Plants, Medicinal · Spectrophotometry · Time Factors


The well-known Kroller method for the determination of cyanide requires the use of the harmful chemicals benzidine (carcinogenic) and bromine (toxic) in the colorimetric part; the analytical result depends strongly on the conduct of the liberation procedure. The substitution of barbituric acid and N-chlorosuccinimide for benzidine and bromine has been investigated. The reproducibility of both colorimetric reactions is similar, but the sensitivity of the barbituric acid colorimetry is ???50% higher. A reproducible liberation yield can be obtained by a proper control of the heating programme. The detection limit for cyanide in a solution is ???10 ??g/l. ?? 1985 Springer-Verlag. Chemicals/CAS: cyanide, 57-12-5; Cyanides; Indicators and Reagents