Silica
Silica
Silica_PTRL_ULow_HTB_Eng_Ody.fm Page 3 of 6
Interferences
13. Touch the timer icon.
Touch
OK.
A one-minute reaction
period will begin. The
destruction of possible
phosphate interference
occurs during this period.
14. When the timer
beeps, pour the contents
of one flask into the
Pour-Thru Cell.
15. After the flow stops,
touch
Zero.
The display will show:
0 µg/L SiO
2
16. Add 1.0 mL of Amino
Acid F Reagent to the
remaining flask. Swirl to
mix.
A faint blue color will
develop if silica is present.
17. Wait at least 15
seconds, then pour the
contents of the second
flask into the Pour-Thru
Cell.
After the flow stops,
touch
Read.
Results will appear in
µg/L SiO
2
.
18. Flush the Pour-Thru
Cell with at least 50 mL of
deionized water
immediately after use.
Interfering Substance Interference Levels and Treatments
Color Eliminated by zeroing the instrument with the original sample (follow procedure).
Iron Interferes at high levels.
pH (extreme) Adjust pH to less than 7. See Section 3.3 Interferences on page 41.
Phosphate (PO
4
3–
) Interferes at levels greater than 50 mg/L PO
4
3–
.
Sulfides Interfere at all levels.
Turbidity Eliminated by zeroing the instrument with the original sample (follow procedure).
Zero
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