The colorimetric determination of cyanide in human food and animal feed.
The well-known Kröller 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 approximately 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 approximately equal to 10 micrograms/l.
D000821:Animal Feed / Q000032:analysis*; D000818:Animals; D003486:Cyanides / Q000032:analysis*; D004355:Drug Stability; D007887:Fabaceae / Q000032:analysis; D005504:Food Analysis; D006801:Humans; D007202:Indicators and Reagents; D010946:Plants, Medicinal; D013053:Spectrophotometry; D013997:Time Factors
D003486:Cyanides; D007202:Indicators and Reagents