Millipore Spectroquant Multy Operating Manual page 173

Measuring range: 0.11 – 8.56 mg/l SiO
0.05 – 4.00 mg/l Si
Attention: In contrast to the instructions given in the package insert the sample volume as well as the reagent volume
must be doubled.
Check the pH of the Select method 4 2 0 .
sample, specified range:
pH 2 – 10.
If required, add dilute
sodium hydroxide
solution or sulfuric acid
drop by drop to adjust
the pH.
Check the pH, specified Reaction time:
range: pH 1.2 – 1.6. 3 minutes
Press Enter to start
the countdown.
Transfer the solution into Insert the blank cell into
a 24-mm cell, close with the cell compartment.
the screw cap. Align the mark on the
cell with that on the pho-
tometer. Press Zero .
Release 08/2014 - Spectroquant
Silicate (Silicic Acid)
24-mm cell
2
24-mm cell
Fill approx. 10 ml of
distilled water into a
24-mm cell (do not add
any reagents!), close
with the screw cap.
(Blank cell)
Add 6 drops of Si-2 and
mix.
Insert the cell containing
the sample into the cell
compartment. Align the
mark on the cell with
that on the photometer.
Press Test .
®
Multy
Pipette 10 ml of the
sample into a test tube.
Add 1.0 ml of Si-3 with
pipette and mix.
Quality assurance:
To check the measurement system (test reagents, meas-
urement device, and handling) ready-for-use silicon stan-
®
dard solution Certipur , Cat.No. 170236, concentration
1000 mg/l Si, can be used after diluting accordingly
(Atten tion! Do not store standard solutions in glass
vessels - see section "Standard solutions").
114794
Test
Add 6 drops of Si-1 and
mix.
Reaction time:
10 minutes
Press Enter to start
the countdown.