VISOCOLOR® ECO Silica: Colorimetric determination of silica. Features: • In acidic solution soluble silica or silicates react with ammonium molybdate to form yellow silicomolybdic acid, which is reduced to silico-molybdenum blue with a reducing agent. (Reaction principle analogous to DIN EN ISO 16264-H57) • Natural water contains silica in different amounts, depending on the geological conditions the water encounters during its course. • The silica occurs partly as soluble silicate, partly colloidal as polysilicic acids. • The silica content in water for medium and high pressure boilers may not exceed certain limits; in power plants therefore constant measurement of the silica content is required. Specifications: • Type: colorimetric test kit • Range: 0 · 0.2 · 0.4 · 0.6 · 1.0 · 1.5 · 2.0 · 2.5 · 3.0 mg/l SiO2 • Sufficient for: 80 determinations • Shelf life at least: 3 years • Sea water suitability: yes • Detectable with PF-12: yes