1.1 Methods
Notes:
1. Rinse all glassware with 1:1 Nitric acid solution first and then rinse with deionised water.
2. Water samples that contain more than 300 mg/l CaCO
3
hardness: after adding the
Vario Ascorbic Acid powder pack add additionally 10 drops of Rochelle Salt Solution.
3. After addition of the reagent solution “Alkaline-Cyanide” a cloudy or turbid solution
may form in some water samples. The turbidity should disappear after point 7.
4. Water samples containing more than 5 mg/l iron should be allowed to react for at least
10 minutes.
5. Conversion:
mg/l MnO
4
= mg/l Mn x 2.17
6.
Mn
MnO
4
KMnO
4
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