TEST METHOD FOR SILICA HR IN INDUSTRIAL WATER (RANGE: 0-100 mg/L SiO2)
BACKGROUND OF THE TEST:
The specified limits of silica are crucial to any industrial equipment in the industrial water such as in
presence of Magnesium, it can form scale deposits in boilers and steam turbines. Consequently, precise
determination of silica in water is of worthwhile.
Nuclotrasis offers user friendly test method with ease of handling the relevant reagents and other
equipments used in the analysis. For determination of soluble silica, this test relies on Lambert Bear’s
Law of spectrometry where silica and any phosphates in the sample react with molybdate ions under
acidic conditions to form yellow color complexes of silicomolybdic acid and phosphomolybdic acid.
Then subsequent suitable acidic treatment vanish the effect of phosphate complexes. Finally the
sample is analyzed and is run on 452 nm and 420 nm for spectrophotometers and colorimeters
respectively.
REAGENTS/EQUIPMENTS/APPARATUS:
Provided 10 mL marked glass vial (Item Code: 02-01)
Any Suitable Spectrophotometer
Relevant Cuvette or cell of Photometer
NUCLOTRASIS SILICA-I TEST SOLUTION (Item Code: 01-09-1)
NUCLOTRASIS SILICA-II TEST SOLUTION (Item Code: 01-09-2)
NUCLOTRASIS SILICA-III TEST SOLUTION (Item Code: 01-09-3)
SAMPLE COLLECTION & PREPARATION
Make sure to immediately analyze the sample after collection of sample.
Ensure to collect sample in a suitable and designated bottle for a specific sample.
Ensure to conduct this test at room temperatures.
TEST PROCEDURE:
1. Take sample to 10 mL mark into the provided vial (Item Code: 02-01) and call it as “A”.
2. Similarly take 10 mL deionized water in another cuvette or test tube for reagent blank and
call it as “B”.
3. In the sample, add 10 drops (0.5 mL) NUCLOTRASIS SILICA-I TEST SOLUTION (Item Code:
01-09-1) and mix gently.
4. Then add 10 drops (0.5 mL) NUCLOTRASIS SILICA-II TEST SOLUTION (Item Code: 01-09-2)
and mix gently.
5. After two (2) minutes, add 10 drops (0.5 mL) NUCLOTRASIS SILICA-III TEST SOLUTION
(Item Code: 01-09-3) and mix well, allow to stand for ten (10) minutes. First run reagent
blank “B” to achieve blanking.
6. Then run test sample “A” and note the Photometer display reading in µg/L or mg/L. In case
photometer is not available, match the developed color with the provided soft copy color
comparator of this SILICA HR test kit.
7. Multiply the reading with dilution factor 1.15.
REFERENCES: Standard Methods for the Examination of Water and Wastewater