Silica Test Kits

Visual Kits

Range MDL Method Type Kit Cat. No. Refill
0.00 - 0.20 ppm 0.02 ppm Heteropoly Blue ULR CHEMets K-9011 R-9011
0.0 - 1.0 & 1 - 10 ppm 0.05 ppm Heteropoly Blue CHEMets K-9010 R-9010

Instrumental Kits

Range Method Type Kit Cat. No.
0 - 10.00 ppm (0 - 4.00 ppm Spectrophotometer) Heteropoly Blue Vacu-vials K-9003

CHEMetrics offers test kits employing the well-known Heteropoly Blue method to deliver sensitivity and accuracy within two minutes or less. Based on CHEMetrics patented Self-Filling Reagent Ampoule technology. Premixed. Premeasured. Precise. Each kit contains 30 tests.

The Heteropoly Blue Method

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 colour. Phosphate interferences are masked with the addition of citric acid. Results are expressed as ppm (mg/l) SiO2.

References:
APHA Standard Methods, 22nd ed., Method 4500-SiO2 D - 1997.
ASTM D 859-05, Silica in Water.
USEPA Methods for Chemical Analysis of Water and Wastes, Method 370.1 (1983).

Applications

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.


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