Millipore Spectroquant Multy Operating Manual page 83

Determination of free chlorine, total chlorine,
Measuring range: 0.02 – 4.50 mg/l Cl
Check the pH of the Select method 1 3 1 ,
sample, specified range: select subitem >>diff.
pH 4 – 8.
If required, add dilute
sodium hydroxide
solution or sulfuric acid
drop by drop to adjust
the pH.
Shake the cell vigor- Reaction time:
ously to dissolve the 1 minute
solid substance. Press Enter to start
the countdown.
Insert anew the cell con-
taining the sample into
the cell compartment.
Align the mark on the
cell with that on the pho-
tometer. Press Test .
(= T2)
Release 08/2014 - Spectroquant
Chlorine
and combined chlorine
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)
Insert the blank cell into
the cell compartment.
Align the mark on the
cell with that on the pho-
tometer. Press Zero .
Important:
Very high chlorine concentrations in the sample produce yellow-colored solu-
tions (measurement solution should be red) and false-low readings are yielded.
In such cases the sample must be diluted (plausibility check).
After each determination of total chlorine rinse the cell with sulfuric acid 25 % and
subsequently several times with distilled water.
For on-the-spot determinations where there are no suitable facilities for rinsing,
the cell contents can be transferred to a new 24-mm cell before the addition of
reagent Cl -2. Use this second cell only for the determination of total chlorine!
2
Quality assurance:
To check the measurement system (test reagents, measurement device, and
handling) a freshly prepared standard solution can be used (see section "Stan-
dard solutions").
®
Multy
Pipette 10 ml of the Add 1 level blue micro-
sample into a 24-mm spoon of Cl
cell. with the screw cap.
Insert the cell containing Remove the sample cell
the sample into the cell from the photometer,
compartment. Align the open, add 2 drops of
mark on the cell with Cl
that on the photometer. screw cap, and mix.
Press Test . (= T1)
100599
Test
-1, close
2
-2, close with the
2