INSTRUCTIONSSilicaHarmful Corrosive(Low Range)

Molybdenum blue Method

Model WAK- SiO2(D)Range: 0.5 - 20 mg SiO2/L (ppm)

H o w

Main reagent: Ammonium Molybdatet ou s e
K-2

K-1

30 sec3 min
1 drop2 drops(1) Fill the Cell
（PACKTEST
Square Cup）up to thefirst line (1.5 ml) withsample. Add 2 drops(~0.13mL) of K-1 reagent.

(2) Put on the cap
and shake theCell 2-3 times.

(3) Wait for 3minutes.

(4) Add 1 drop ofK-2 reagent..

(5) Put on the cap
and shake theCell 2-3 times.

(6) Wait for 30
seconds.

< SiO2>
mark
Pull out the line.

3 mininsert
thePACKTEST inthe groove, asshown.

(7) Remove the line toclear the aperturefrom the top of thetube.

(8) Press the sides of the tube
to expel approximately
half of volume. Maintainpressed.

(9) Immerse the tube in the sample.
Release the sides to fill thetube up to the half. Shake thetube lightly 5 - 6 times.

(10) After 3 minutes, put thetube on the color chart asshown and compare withthe standard colors.

How to read the test
After the reaction time, compare the color of the tube with the standard colors. The nearest color indicates the measured
value of the sample. A color between two standard colors indicates a value between the two standard values.

Care in handling of PACKTEST before and after use
Keep PACKTEST in a cool, dry and dark place.
PACKTEST should be thrown with burnable garbage. Conform to the legislation of waste management.
Use a package as soon as possible after opening.

First Aid Measures
K-1 reagent contains diluted sulfuric acid ( pH ≤ 2 ) and K-2 reagent contains oxalic acid ( pH ≤ 2 ). It isharmful and corrosive to eyes and skin.
Eye contact

Immediately rinse eyes with water for at least 15 minutes. Consult a physician.

Skin contact

Immediately flush skin with water.

Ingestion

Immediately rinse mouth. Consult a physician.

In case of doubt, consult a physician.

9021

PACKTEST

Silica (Low Range)

Features
The Silica (Low Range) PACKTEST is based on the molybdenu blue color comparison method.
The Silica (Low Range) PACKTEST allows to measure silica concentration easily from sample likeindustrial wastewater.

Cautions
1. The Silica (Low Range) PACKTEST can only measure SiO 32- ions.
2. The normal pH range is 2 - 9. If necessary, adjust the pH with diluted sulfuric acid or sodiumhydroxide solution.
3. Keep sample temperature in the range 15°C - 40°C. Lower temperature necessitates longer
reaction time.
4. Ensure that PACKTEST tube is filled up to the half.
5. Partially undissolved reagent will not affect the measurement.
6. Read the test under daylight type lamp.
7. Carefully wash the small pipette with the samlpe before use .
8. Put the line back into the aperture after using to prevent reagent spilt.

Interferences
Standard colors were determined from standard solutions. However, coexisting substances willcause inaccurate results. The list below reports ion concentrations under which ones interferences
are insignificant:≤ 1000 mg/L : Al3+, B3+, Ba2+, Ca2+, Cl-, CN-, Fe2+, I-, K+, Mg2+, Mn2+, Mo6+, Na+, NH4+, NO3-,SO42-, Zn2+, Anionic surfactant, Phenol, Residual Chlorine, Formaldehyde≤ 500 mg/L : Ni2+, NO2≤ 300 mg/L : As3+≤ 200 mg/L : Cr6+
≤ 100 mg/L : Co2+, Cu2+, F-, Fe3+,≤ 50 mg/L : PO43≤ 10 mg/L : Cr3+
The Silica (Low Range) PACKTEST is not suitable for sea water samples.
Oxidative and reducing chemical can interfere with the measurement.