1.1 Methods
Notes:
1. Strong alkaline or acidic water samples must be adjusted between pH 4 and pH 10
before the tablet is added (use 1 mol/l Hydrochloric acid resp. 1mol/l Sodium hydroxide).
2. The tolerance of the method is increasing with higher concentrations. When diluting
samples, this should be take into account, always measuring in the first third of the
range.
3. This method was developed from a volumetric procedure for the determination of
calcium. Due to undefined conditions, the deviations from the standardised method may
be greater.
4. It is convenient to use special vials with larger volume.
5.
CaCO
3
°dH
°eH
°fH
°aH
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