Sartorius IB 31000 P Specifications download pdf (Page 27)

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Outline of the Na/genefilter funnel.

11.

pH measurements

The pH of a solution is measured in the physico-chemical lahoratory hy means of a Jenway PCP505

glass combination probe in combination with a Jenway 3040 Ion Analyser. The pH is measured with

an accuracy of ±0.005 in a range of -2 to 16. The maximum solution temperature in which the probe

may be used in is 100°C. The Ion Analyser is also provided with a PCT121 temperature probe, which

can operate in a range of -30 to

150°C with an accuracy of

0.5°C.

The instrument has to he calibrated before every measurement. For the calibration two of three

standard solutions are used. The pH values of these standard solution are about 4, 7 or 9, but depend

slightly on the temperature, for the pH is a function of the temperature. The Jenway Ion Analyser

stores the calibration data and generates a Iinear calibration curve, which is also stored in its memory.

After calihration the pH-meter can he used. Make sure that the temperature of the solutions is

constant. Place the pH- and temperature probe in the solution to be measured. The Ion Analyser will

determine the pH of the solution, thereby taking possible temperature effects into account. For further

information about pH measurements see [13].

12. Acknowledgements

This work was partly funded by the Commission of the European Communities, Directorate General

for Science, Research and Development under MAST Contract no. 0035 (G6 Morphodynamics

research programme).

The writer would Iike to express his appreciation to dr.ir. Cees Kranenburg, Senior Research

Scientist, for his valuable advice and suggestions.

Special thanks go to Miss Manon Moot and other staff of the Hydromechanics Laboratory for their

keen assistance in the experiments.

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Sartorius IB 31000 P Specifications Page 27