Cyanide ions are very toxic because they block the iron of the
respiratory enzyme and thus inhibit the oxygen transport. For humans 1 mg cyanide per kg body weight
is considered lethal.
This test covers free cyanide and cyanide complexes which can be destroyed with
chlorine. If interfering substances like heavy metal complexes, thiocyanate, sulphide, dyes or aromatic
amines are present, a distillation according to DIN 38 405-D 13–2–2 must precede the cyanide
For the determination of easily released and total cyanide as well as for the
determination of cyanide in stone fruit spirits please contact MACHEREY-NAGEL for special instructions.