Millipore Spectroquant Multy Operating Manual page 74

Determination of free chlorine, total chlorine,
Measuring range: 0.05 – 5.00 mg/l Cl
Check the pH of the Select method 1 3 0 ,
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
16-mm cell
2
Fill approx. 10 ml of
distilled water into an
empty 16-mm cell (do
not add any reagents!),
close with the screw
cap.
(Blank cell)
Insert the blank cell into
the cell compartment.
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 16-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 5.0 ml of the Add 1 level blue micro-
sample into a round cell. spoon of Cl
with the screw cap.
Insert the cell containing Remove 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)
100597
Cell Test
-1, close
2
-2, close with the
2