Impex Produkter Visocolor Powder Pillows Silica LR User Manual

Impex Produkter Visocolor Powder Pillows Silica LR

Silica LR
Reagent set for the photometric determination of the silica content in boiler feed water and ultrapure water.

Measuring range:

• 0.02–2.10 mg/L SiO2
• 0.01–1.00 mg/L Si

Method:
Photometric determination of the silica content using the silicomolybdic acid method analogous to APHA 4500‑Si E and DIN 38 405 – D21.

Hazard warning:
Information regarding safety can be found on the box’ label and in the safety data sheet. You can download the SDS from www.mn-net.com/SDS.

Procedure:
We recommend mixing the sample solution and the reagents in a plastic beaker and transferring the solution to the cuvette directly before measuring.

Requisite accessories: 2 test tubes 16 mm OD (REF 91680) or 2 test tubes 24 mm OD (REF 936101)

1. Rinse test tube several times with sample (pH value of sample must be between pH 3 and 13)
   Blank (optional):

2. Fill one test tube with 5 mL of sample

3. Clean test tube

4. Place test tube in photometer as blank value and adjust for zero
   Sample:

5. Fill another test tube with 5 mL of sample

6. Add 5 drops of molybdate reagent

7. Close test tube and shake well

8. Wait for 2 min

9. Add content of 1 Powder Pillow “citric acid reagent”

10. Close test tube and shake well

11. Wait for 1 min

12. Add content of 1 Powder Pillow “ascorbic acid reagent”

13. Close test tube and shake well

14. Clean test tube

15. Wait for a 3-min reaction time

16. Measure

Measurement

See manual for all MACHEREY-NAGEL photometers. Work should be performed quickly, since if the sample is allowed to remain in the test tube for a longer period of time, silica can be released from the glass of the test tube It should additionally be ensured that any distilledwater used for dilution is silica-free (REF 918912). After use, rinse out test tubes thoroughly and seal them This method is also suitable for the analysis of sea water.

Interferences

The following will not interfere: < 10 mg/L PO4 3– The following will interfere: large amounts of Fe2+/3+, large amounts of oxidising agents, sulphides According to APHA 4500‑Si D, there is a modification of the silica which does not react with molybdate. This molybdate- unreactive form can be converted into the reactive species through heating or fusing with a base (e.g. digestion with sodium bicarbonate NaHCO3).

Disposal of samples:
Information regarding disposal can be found in the safety data sheet. You can download the SDS from www.mn-net.com/SDS.

Blank (optional)

Sample

MACHEREY-NAGEL GmbH & Co. KG

• Neumann-Neander-Str. 6–8
• 52355 Düren
• Germany
• Tel.: +49 24 21 969-0
• info@mn-net.com
• www.mn-net.com

References

• MACHEREY-NAGEL Webshop | MACHEREY-NAGEL

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