Tintometer Aqualytic AL100 Mode D'emploi page 41

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Methods
GB
Notes:
1. For photometric determination of pH-values only use PHENOL RED tablets in black
printed foil pack and marked with PHOTOMETER.
2. Water samples with low values of Alkalinity-m (below 35 mg/l CaCO
pH readings.
3. pH-values below 6.5 and above 8.4 can produce results inside the measuring range.
A plausibility test (pH-meter) is recommended.
4. Salt error
For salt concentrations below 2 g/l no significant error, due to the salt concentration of
the reagent tablet, is expected. For higher salt concentrations the measurement values
have to be adjusted as follows:
Salt content
Correction
according to Kolthoff (1922)
1)
according to Parson und Douglas (1926)
2)
Reagent
PHENOL RED PHOTOMETER
MD100_1 02/2018
30 g/l (seawater)
- 0,15 - 0,21
1)
Form of reagent/Quantity
Tablet / 100
) may give wrong
3
60 g/l 120 g/l
- 0,26
2) 2)
Order-No.
4511770BT
180 g/l
- 0,29
2)
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