Check the pH, specified
range:
pH 1.2 – 1.6.
Pipette 5.0 ml of the
sample into a test tube.
Add 3 drops of Si-2
and mix.
Measuring 0.21 – 10.70 mg/l SiO
2
0.10 – 5.00 mg/l Si 10-mm cell
range: 0.10 – 5.35 mg/l SiO
2
0.05 – 2.50 mg/l Si 20-mm cell
0.011 – 1.600 mg/l SiO
2
0.005 – 0.750 mg/l Si 50-mm cell
Expression of results also possible in mmol/l.
Silicate (Silicic Acid)
114794
Test
Add 3 drops of Si-1
and mix.
Reaction time:
10 minutes
Transfer the solution into
a corresponding cell.
Select method with
AutoSelector.
Place the cell into the
cell compartment.
Important:
To measure in the 50-mm cell, the sample volume and
the volume of the reagents hav
e to be doubled for each.
Alternatively, the semi-microcell, Cat.No. 173502, can be
used.
Quality assurance:
To check the measurement system (test reagents,
measurement device, and handling) ready-f
or-use silicon
standard solution
Certipur
®
, Cat.No. 170236, concentra-
tion 1000 mg/l Si, can be used after diluting accordingly.
(Atten tion! Do not store standard solutions in glass
vessels - see section "Standard solutions"!)
Reaction time:
3 minutes
Add 0.50 ml of Si-3 with
pipette and mix.
Check the pH of the
sample, specified range
:
pH 2– 10.
If required, add dilute
sodium hydroxide
solution or sulfuric acid
drop by drop to adjust
the pH.
Release 06/2014 - Spectroquant
®
UV/VIS Spectrophotometer Pharo 300
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