Chematest 35
Additional Parameters
A-96.730.121 / 160920
25
7.
Additional Parameters
7.1. Determination of Acid Binding Capacity ACD
pH 4.3
Required
utensils
Use the following utensils from the Chematest 35 carrying case:
cuvette
cuvette adapter
syringe
Procedure
1
Place the cuvette in the cuvette adapter.
2
Empty 10 ml of sample into the cuvette using the syringe.
3
Add 5 drops of Oxycon-IN.
4
Close the cap of the cuvette adapter and turn it over to mix.
The solution turns blue.
5
Add Oxycon-CH drop by drop and count the exact number of
drops. Mix after each drop and check the sample color.
First, the sample color changes to light gray. After the
required number of drops has been added, the solution turns
light red.
6
Once the sample has turned light red, stop reagent addition.
7
From the number of drops, calculate the carbonate hardness
according to the conversion factors below.
Conversion
factors
Each drop of Oxycon-CH corresponds to one German degree of
carbonate hardness.
1 °dH German degree corresponds to:
1,25 °eH English degrees
1.78 °fH French degrees
17.8 mg CaCO
3
per liter
0.357 mmol/l acid binding capacity K
S 4.3
0.18 mmol/l alcaline-earth ions
