1.1 Methods
Notes:
1. Clean vials with the brush immediately after analysis.
2. Vials and stirring rods may turn blue after prolonged use. In this case clean vials and
stirring rods with a laboratory detergent (see chapter 1.2.2 Cleaning of vials and
accessories for analysis). Rinse vials and caps thoroughly with tap water and then with
deionised water.
3. The test result is influenced by Hardness and Total Alkalinity.
The calibration of this method was done using water with the following concentration:
Ca-Hardness: 200 mg/l CaCO
3
Total Alkalinity: 120 mg/l CaCO
3
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