|Range||MDL||Method||Kit Catalog No.||Refill Catalog No.|
|0-0.20 ppm||0.02 ppm||Heteropoly Blue||K-9011||R-9011|
|0-1 & 1-10 ppm||0.05 ppm||Heteropoly Blue||K-9010||R-9010|
|Range||Method||Kit Catalog No.|
|V-2000: 0-10.00 ppm / Spec: 0-4.00 ppm||Heteropoly Blue||K-9003|
Silica (SiO2) is the oxide of silicon, the second most abundant element in the earth’s crust. Silica is present as silicates in most natural waters. Typical concentrations lie between 1 and 30 mg/L. Higher concentrations may exist in brackish waters and brines. The silica content of water should be determined prior to its use in a variety of industrial applications. Silica can form a harmful scale on equipment and heat transfer surfaces, particularly steam turbine blades.
CHEMetrics’ test method determines molybdate reactive silica. The heteropoly blue chemistry is employed. Silica reacts with ammonium molybdate under acidic conditions to produce heteropoly acids, which are then reduced to form a blue color. Phosphate interferences are masked with the addition of citric acid. Results are expressed as ppm (mg/L) SiO2.