133
MD 610_2d 11/2019
Notes:
1. To optimise the readings an optional batch related calibration can be performed using
Mode 40, see page 334.
2. Strong alkaline or acidic water samplesmust be adjusted to a pH-value between pH 4
and 10 before the tablets are added (use 1 mol/l Hydrochloride acid resp. 1 mol/l Sodium
hydroxide).
3. For accurate test results exactly 10 ml of water sample must be taken for the test.
4. Thismethod was developed from a volumetric procedure for the determination of
Calcium Hardness.Due to undefined conditions, the deviations from the standardised
method may be greater.
5. The tolerance of the method is increasingwith higher concentrations. When diluting
samples,this should be taken in account, always measuring in the first third of the
range.
6. Interferences:
• Magnesium hardnessup to 200 mg/l CaCO
3
does not interfere.
• Iron concentration above 10 mg/l may causelow results.
• Zinc concentration above 5 mg/l may causehigh results.
7.
CaCO
3
°dH
°eH
°fH
°aH
Reagent
Form of reagent/Quantity
Order-No.
Set
CALCIO H No. 1 / No. 2
Tablet / per 100
inclusive stirring rod
517761BT
Содержание Lovibond MD 610
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