Millipore Spectroquant Multy Operating Manual page 175

Measuring range: 0.004 – 0.500 mg/l SiO
0.002 – 0.234 mg/l Si
Check the pH of the Select method 4 2 2 .
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. 5 minutes
Press Enter to start
the countdown.
Transfer the blank into a Insert the blank cell into
24-mm cell, close with the cell compartment.
the screw cap and Align the mark on the
measure immediately. cell with that on the pho-
tometer. Press Zero .
Important:
No glass equipment may be used in the course of the
determination (e. g. pipettes etc.)!
Release 08/2014 - Spectroquant
Silicate (Silicic Acid)
24-mm cell
2
24-mm cell
Pipette 10 ml of the
sample into a plastic
vessel (Flat-bottomed
tubes, Cat.No. 117988).
Add to each vessel
3 drops of Si-2,
close with the screw
cap, and mix.
Transfer the measure-
ment sample into a
24-mm cell, close with
the screw cap and
measure immediately.
®
Multy
Pipette 10 ml of distilled
water (Water Ultrapur,
Cat.No. 101262, is
recommended) into a
second plastic vessel
(Flat-bottomed tubes,
Cat.No. 117988).
(Blank)
Add to each vessel
0.50 ml of Si-3 with
pipette, close with the
screw cap, 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 .
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").
101813
Test
Add to each vessel
3 drops of Si-1,
close with the screw
cap, and mix.
Reaction time:
5 minutes
Press Enter to start
the countdown.