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MD 610_2d 11/2019
Notes:
1. For photometric determination of pH values only use THYMOLBLUEtabletsin black
printed foil pack and marked with PHOTOMETER.
2. pH values below 8.0 and above 9.6 can produce results inside the measuring range.
A plausibility test (pH-meter) is recommended.
3. The accuracyof the colorimetric determination of pH valuesdepends on various
boundary conditions (buffer capacity of the sample, salt contents etc.).
4. Salt error
Correction of test results (averagevalues)for sampleswith salt contents of:
Indicator
Salt content
Thymolblue
1 molar
– 0.22
2 molar
– 0.29
3 molar
– 0.34
The values of Parsonand Douglas (1926) are based on the use of Clark and Lubs buffers.
1 Mol NaCl = 58.4 g/l = 5.8 %
Reagent
Form of reagent/Quantity
Order-No.
THYMOLBLUE PHOTOMETER
Tablet / 100
515710
Содержание Lovibond MD 610
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