Silica
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Method
Instrumental Kits
References: APHA Standard Methods, 20
th
ed., pp.
V-2000 Multi-Analyte Photometer
4-158, Method 4500-SiO
2
D (1998). ASTM D 859-05,
(See page 12 for instrumental features)
Silica in Water. USEPA Methods for Chemical Analysis
of Water and Wastes, Method 370.1 (1983).
Range: V-2000: 0.50-10.00 ppm / Spec: 0.25-4.00 ppm
Silica (SiO
2
) is the oxide of silicon, the second most
Method: Heteropoly Blue
abundant element in the earth’s crust. Silica is present
Cat#
as silicates in most natural waters. Typical concentra-
Vacu-vials Kit K-9003
tions lie between 1 and 30 mg/L. Higher concentra-
Kit comes in a cardboard box and contains everything needed to perform 30
tions may exist in brackish waters and brines. The silica
tests: thirty ampoules, Neutralizer Solution, Activator Solution, 25 mL sample
cup, sample cup top, ampoule blank, instructions, calibration table, and MSDS.
content of water should be determined prior to its use
in a variety of industrial applications. Silica can form a
Vacu-vials Kits require the use of the V-2000 Photometer or
a spectrophotometer capable of accepting a 13 mm diameter round cell.
harmful scale on equipment and heat transfer surfaces, Instrument sold separately.
particularly steam turbine blades.
Kit Components common to Silica
CHEMetrics’ test method determines molybdate
Description Cat#
reactive silica. The heteropoly blue chemistry is
Sample Cup Pack, 25 mL (6 ea) A-0013
employed. Silica reacts with ammonium molybdate
Sample Cup Top Pack for 25 mL Cup (6 ea) A-0014
under acidic conditions to produce heteropoly acids,
Ampoule Blank Pack (5 ea) A-0023
which are then reduced to form a blue color.
1
The accessory pack supplies enough solution to perform at least
Phosphate interferences are masked with the addition 200 tests.
of citric acid. Results are expressed as ppm (mg/L) SiO
2
2
. This shelf-life can be extended by 18 months if the ampoules are
stored in the refrigerator when not in use.
Instructions are posted on our website.
Visual Kits
Range: 0-0.20 ppm
MDL: 0.02 ppm / Method: Heteropoly Blue
Cat#
ULR CHEMets Kit K-9011
ULR CHEMets Refill, 30 ampoules, Shelf-life 2 months R-9011
2
Neutralizer Solution Pack, six 10 mL bottles, Shelf-life 2 years A-9000
1
Activator Solution Pack, six 20 mL bottles, Shelf-life 2 years A-9001
1
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.
Range: 0-1 & 1-10 ppm
MDL: 0.05 ppm / Method: Heteropoly Blue
Cat#
CHEMets Kit K-9010
CHEMets Refill, 30 ampoules, Shelf-life 11 months R-9010
2
Neutralizer Solution Pack, six 10 mL bottles, Shelf-life 2 years A-9000
1
Activator Solution Pack, six 20 mL bottles, Shelf-life 2 years A-9001
1
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.
72
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