Tintometer Lovibond MD 200 Mode D'emploi page 28

Methods
GB
O3
0.0.0
Zero
!
Test
O3
RESULT
Zero
!
Test
O3
RESULT
28
Ozone in presence of Chlorine with Tablet
0.02 – 2 mg/l
Fill a clean vial (24 mm Ø) with 10 ml of the water sample and
perform zero calibration (see "Operation").
Remove the vial from the sample chamber and empty it, leaving a
few drops remaining in the vial.
Add one DPD No. 1 tablet and one DPD No. 3 tablet straight
from the foil to the water sample and crush the tablets using a clean
stirring rod.
Add the water sample to the 10 ml mark.
Close the vial tightly with the cap and swirl gently several times until
the tablets are dissolved.
Place the vial in the sample chamber making sure that the
are aligned.
Wait for a reaction period of 2 minutes.
(Countdown can be activated, see page 25)
The method symbol flashes for approx. 3 seconds.
The result is shown in the display. (result A)
Remove the vial from the sample chamber and empty the vial. Rinse
vial and cap several times.
Fill a second clean vial with 10 ml of water sample.
Add one Glycine tablet straight from the foil to the water sample
and crush the tablet using a clean stirring rod (Glycine solution).
Close the vial tightly with the cap and swirl gently several times until
the tablet is dissolved.
Add one DPD No. 1 tablet and one DPD No. 3 tablet straight from
the foil into the first cleaned vial and crush the tablets using a clean
stirring rod.
Transfer the contents of the second vial (Glycine solution) into
the prepared vial.
Close the vial tightly with the cap and swirl gently several times until
the tablets are dissolved.
Place the vial in the sample chamber making sure that the
are aligned.
Wait for a reaction period of 2 minutes.
(Countdown can be activated, see page 25)
The method symbol flashes for approx. 3 seconds.
The result is shown in the display. (result B)
marks
marks
MD200_4 03/2018