Camlab Lovibond MD 610, Instruction Manual

Page: 249 / 371

243
MD 610_2d 11/2019
Notes:
1. For photometric determination of pH values only use BROMOCRESOLPURPLEtabletsin
black printed foil pack and marked with PHOTOMETER.
2. pH values below 5.2 and above 6.8 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
Bromcresolpurple 1 molar
– 0.26
2 molar
– 0.33
3 molar
– 0.31
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.
BROMOCRESOLPURPLEPHOTOMETER Tablet / 100 515700BT