Lovibond MD200 - Chlorine Testing with Liquid Reagent; Chlorine Measurement using Liquid Reagents

36
MD200_8 07/2016
GB
Methods
RESULT
RESULT
0.0.0
!
Zero
Test
Zero
Test
CL 6
CL 6
CL 6
Chlorine with liquid reagent
0.02 – 4.0 mg/l
a) free Chlorine
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 the vial.
Fill the vial with drops of the same size by holding the bottle vertically
and squeeze slowly:
6 drops of DPD 1 buffer solution
2 drops of DPD 1 reagent solution
Add the water sample to the 10 ml mark.
Close the vial tightly with the cap and invert several times to mix the
contents.
Place the vial in the sample chamber making sure that the
marks
are aligned.
Press the [ZERO/TEST] key.
The method symbol flashes for approx. 3 seconds.
The result is shown in the display in mg/l free Chlorine.
b) total Chlorine
Immediately after measurement add
3 drops of DPD 3 solution to the already coloured test solution.
Close the vial tightly with the cap and invert several times to mix the
contents.
Place the vial in the sample chamber making sure that the
marks
are aligned.
Wait for a reaction period of 2 minutes.
(Countdown can be activated, see page 33)
The method symbol flashes for approx. 3 seconds.
The result is shown in the display in mg/l total Chlorine.
c) combined Chlorine
combined Chlorine = total Chlorine – free Chlorine
Tolerances:
0 – 1 mg/l: ± 0.05 mg/l
> 1 – 2 mg/l: ± 0.10 mg/l
> 2 – 3 mg/l: ± 0.20 mg/l
> 3 – 4 mg/l: ± 0.30 mg/l