Alkalinity-m with Tablet
5 – 200 mg/l
Fill a clean vial (24 mm Ø) with 10 ml of the water sample and
perform zero calibration (see “Operation").
Add one ALKA-M-PHOTOMETER tablet straight from the foil to the
10 ml water sample and crush the tablet using a clean stirring rod
.
Close the vial tightly with the cap and swirl gently several times until
the tablet is dissolved.
Place the vial in the sample chamber making sure that the
marks
are aligned.
Press the [ZERO/TEST] key.
The method symbol flashes for approx. 3 seconds.
The result is shown in the display in mg/l CaCO
3
.
Tolerance: ± 5% (full scale)
0.0.0
Zero
Test
GB
Methods
RESULT
Notes:
1. The terms total Alkalinity, Alkalinity-m, m-Value and Alkalinity to pH 4.3 are identical.
2. For accurate results exactly 10 ml of water sample must be taken for the test.
3. Conversion table:
Acid demand to pH 4.3
DIN 38 409 (KS4.3)
German
°dH*
English
°eH*
French
°fH*
1 mg/l CaCO
3
0.02 0.056 0.07 0.1
*Carbonate hardness (reference = Hydrogencarbonate-anions)
Example:
10 mg/l CaCO
3
= 10 mg/l · 0.056 = 0.56 °dH
10 mg/l CaCO
3
= 10 mg/l · 0.02 = 0.2 mmol/l
tA
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