B Ph Value - Tintometer Lovibond Photometer Mode D'emploi

Z E R O O K
P R E S S " T E S T "
R U N T E S T
Test
p H : 7 . 9 5
Notes
For photometric determination of pH values, only use PHENOLRED-tablets in black printed foil
pack and marked PHOTOMETER.
pH values below 6.5 and above 8.4 can produce results inside the measuring range.
A plausibility test (pH meter) is recommended. Water samples with low values of Total Alkalinity-
m may give wrong pH readings.
Accuracy of the Method
The accuracy of the colorimetric determination of the pH value is dependent on various boundary
conditions (buffer capacity of the sample, salt content etc.).
Salt Error
Correction of test results (average values) for samples with a salt content of:
Indicator
PHENOLRED
The values of Parsons and Douglas (1926) are based on the use of Clark and Lubs buffers.
(1 Molar Na Cl = 58.4 g/l ≈ 5.5 %)
B pH value
After zeroing, the display shows:
1. Remove cell from cell compartment.
2. Add a PHENOLRED PHOTOMETER-tablet to the 10
ml water sample, crush and mix well with a clean
stirring rod. Fit a clean stopper to the cell.
3. Place cell immediately in the cell compartment, close
the lid and press the TEST key. The result will be
displayed as pH value.
The display shows the result as pH value:
Salt Content
1 Molar 2 Molar
– 0.21 – 0.26
31
3 Molar
– 0.29