4.2 Quantitative determination
using liquid reagents
Chlorine with liquid reagents 0.01 ...
4.0 mg/l
Use the
[MODE] key to select [Cl].
a) Free chlorine
1.
Take your cuvette set 1
2.
In a 24 mm cuvette add a 10 ml
water sample and carry out a
zero correction, see
3.
Remove the cuvette from the
sample chamber and empty the
cuvette completely
4.
Hold the dropping bottle upright
and by slow pressing, add equal
sized drops into the cuvette:
n
6 drops ➨ DPD 1 buffer sol‐
ution
n
2 drops ➨ DPD 1 reagent
solution
Fill the cuvette up to the 10 ml
marking with the water sample
5.
Close the cuvette using the cuv‐
ette lid
6.
Mix the contents of the cuvette
by tipping it back and forth
7.
Position the cuvette in the
sample chamber
ð
Observe the correct posi‐
tioning of the cuvette.
8.
Press the key
[ZERO/TEST]
ð
[METHOD] flashes for
approximately 3 seconds.
The result in mg/l of free
chlorine appears in the dis‐
play.
b) Total chlorine
1.
Take your cuvette set 2
2.
In a 24 mm cuvette add a 10 ml
water sample and carry out a
zero correction, see
3.
Remove the cuvette from the
sample chamber and empty the
cuvette completely
4.
Hold the dropping bottle upright
and by slow pressing, add equal
sized drops into the cuvette:
n
6 drops ➨ DPD 1 buffer sol‐
ution
n
2 drops ➨ DPD 1 reagent
solution
n
3 drops ➨ DPD 3 solution
Fill the cuvette up to the 10 ml
marking with the water sample
5.
Close the cuvette with the cuv‐
ette lid and mix the contents by
tipping back and forth
6.
Place the cuvette in the sample
chamber
ð
Observe the correct posi‐
tioning of the cuvette.
Analysis methods
19