VISOCOLOR® HE Cyanide • Colorimetric determination of cyanide • Cyanide ions react with chlorine to form cyanogen chloride, which splits the pyridine ring and forms glutaconedialdehyde. • By aldol condensation with barbituric acid a violet polymethine dye is produced. • Type: high sensitive test kit • Range: 0.0 · 0.002 · 0.004 · 0.007 · 0.010 · 0.015 · 0.020 · 0.025 · 0.030 · 0.040 mg/l CN– • Sufficient for: 55 determinations • Shelf life at least: 12 months • Sea water suitability: yes • Detectable with PF-11 no • 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 test. • 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.