VISOCOLOR® ECO Nickel: Colorimetric determination of nickel • In ammonia solution nickel ions react with diacetyldioxime after oxidation with bromine to form a reddish-brown dye.• Insoluble nickel compounds (e. g. nickel cyanide, nickel carbonate) and the nickel cyano complexes are not determined. Type: colorimetric test kit Range: 0 · 0.1 · 0.2 · 0.3 · 0.5 · 0.7 · 0.9 · 1.2 · 1.5 mg/l Ni2+ Sufficient for: 150 determinations Shelf life at least: 1.5 years Sea water suitability: yes, after dilution (1+9) Detectable with PF-12: yes • Nickel can be present in industrial waste water. It occurs as the divalent ion or as a nickel complex.