Lovibond MD200 - Alkalinity and Acidity Testing; Acid Demand to pH 4.3 Measurement

43
MD200_8 07/2016
GB
Methods
Acid demand to pH 4.3 with Tablet
0.1 – 4 mmol/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 as Acid demand to pH 4.3 in
mmol/l.
Tolerance: ± 5% (full scale)
0.0.0
Zero
Test
RESULT
S:4.3
S:4.3
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
in mmol/l
CaCO
3
Calciumcarbonate
Factor
°dH*
german Hardness
Factor
°fH*
french Hardness
Factor
°eH*
english Hardness
Factor
x Factor = Result
50 2.8 5.0 3.5
* Carbonate hardness (reference = Hydrogencarbonate-anions)
Example: 2.5 mmol/l · 2.8 = 7.0° german Hardness (°dH)
Reagent Form of reagent/Quantity Order-No.
ALKA-M-PHOTOMETER Tablet / 100 513210BT