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Silica |
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Method
References: APHA Standard Methods, 20th ed., pp. 4-158, Method 4500-SiO2 D (1998). ASTM D 859-00, Silica in Water. USEPA Methods for Chemical Analysis of Water and Wastes, Method 370.1 (1983).
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. |
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| • Click to View MSDS and Kit instructions |
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 Visual Kits |
0-0.20 ppm
0.02 ppm / Method: Heteropoly Blue |
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Cat# |
| ULR CHEMets Kit |
K-9011 |
| | ULR CHEMets Refill, 30 ampoules, Shelf-life 2 months | R-9011 |
| | Neutralizer Solution Pack, six 10 mL bottles, Shelf-life 2 years | A-9000 |
| | Activator Solution Pack, six 20 mL bottles, Shelf-life 2 years | A-9001 |
| | Comparator, Shelf-life 2 years:
0, 0.02, 0.04, 0.06, 0.08, 0.12, 0.16, 0.20 ppm | C-9011 |
| | Kit comes in a plastic case and contains everything needed to perform 30 tests: Refill, Comparator, Neutralizer Solution, Activator Solution, 25 mL sample cup, sample cup top, instructions, and MSDS. | |
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0-1 & 1-10 ppm
0.05 ppm / Method: Heteropoly Blue |
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Cat# |
| CHEMets Kit |
K-9010 |
| | CHEMets Refill, 30 ampoules, Shelf-life 11 months | R-9010 |
| | Neutralizer Solution Pack, six 10 mL bottles, Shelf-life 2 years | A-9000 |
| | Activator Solution Pack, six 20 mL bottles, Shelf-life 2 years | A-9001 |
| | Low Range Comparator, Shelf-life 2 years:
0, 0.1, 0.2, 0.3, 0.4, 0.6, 0.8, 1.0 ppm | C-9001 |
| | High Range Comparator, Shelf-life 2 years:
1, 2, 3, 4, 5, 6, 7, 8, 10 ppm | C-9010 |
| | Kit comes in a plastic case and contains everything needed to perform 30 tests: Refill, Low and High Range Comparators, Neutralizer Solution, Activator Solution, 25 mL sample cup, sample cup top, instructions, and MSDS. | |
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 Instrumental Kits |
V-2000: 0.50-10.00 ppm / Spec: 0.25-4.00 ppm
Heteropoly Blue |
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Cat# |
| Vacu-vials Kit |
K-9003 |
| | Kit comes in a cardboard box and contains everything needed to perform 30 tests: thirty ampoules, Neutralizer Solution, Activator Solution, 25 mL sample cup, sample cup top, ampoule blank, instructions, calibration table, and MSDS. | |
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Kit Components common to Silica |
| Description |
Cat# |
| | Sample Cup Pack, 25 mL (6 ea) | A-0013 |
| | Sample Cup Top Pack for 25 mL Cup (6 ea) | A-0014 |
| | Ampoule Blank Pack (5 ea) | A-0023 |
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