Visocolor Silica



Colorimetric determination of silica

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.
Phosphates interfere only in high concentrations (> 30 mg/l PO43-).
(Reaction principle analogous to APHA 4500-SI-E, DIN EN ISO 16264-H57)


Data and ordering information

Cat No. 920 087
Type high sensitive test kit
Range 0.0 · 0.01 · 0.02 · 0.03 · 0.05 · 0.07 ·
0.10 · 0.15 · 0.20 · 0.30 mg/l Si
Sufficient for 120 determinations
Shelf life at least 24 months
Sea water suitability yes
Detectable with PF-11 no


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.

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