Millipore Spectroquant Multy Operating Manual page 91

Measuring range: 0.05 – 8.50 mg/l ClO
Check the pH of the Select method 1 4 0 .
sample, specified range:
pH 4 – 8.
If required, add dilute
sodium hydroxide
solution or sulfuric acid
drop by drop to adjust
the pH.
Reaction time: Add 1 level blue micro-
2 minutes spoon of ClO
Press Enter to start with the screw cap.
the countdown.
Insert the cell containing
the sample into the cell
compartment. Align the
mark on the cell with
that on the photometer.
Press Test .
Important:
Very high chlorine dioxide concentrations in the sample
produce yellow-colored solutions (measurement solution
should be red) and false-low readings are yielded. In such
cases the sample must be diluted (plausibility check).
Release 08/2014 - Spectroquant
Chlorine Dioxide
24-mm cell
2
Fill approx. 10 ml of
distilled water into a
24-mm cell (do not add
any reagents!), close
with the screw cap.
(Blank cell)
Shake the cell vigor-
-2, close ously to dissolve the
2
solid substance.
®
Multy
Pipette 10 ml of the
sample into a 24-mm
cell.
Reaction time:
1 minute
Press Enter to start
the countdown.
Quality assurance:
To check the measurement system (test reagents, meas-
urement device, and handling) a freshly prepared standard
solution can be used (see section "Standard solutions").
100608
Test
Add 2 drops of ClO -1,
2
close with the screw
cap, and mix.
Insert the blank cell into
the cell compartment.
Align the mark on the
cell with that on the pho-
tometer. Press Zero .