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Technical Information >> (3G) pH measurement
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Measuring pH
The pH is difficult to measure as there tends to be lot of drift caused by the emulsion particles fouling the electrodes. Even so, pH measurements are useful. The pH is measured with a pH meter and standard electrodes.
The pH of a new solution is about 5.0 when it has settled down (after 48 hours). Prior to this time, the pH will be high due to the acid being locked up in the disperse phase. High pH accompanied by high conductivity will indicate the drag in of cleaning materials (or other alkalis). Low pH accompanied by very high conductivity may indicate the drag in of acids and/or metal ions. If the low pH is due to normal acid build up, no permanent harm is done. High pH causes precipitation.
In both the above cases the contaminants should be removed by ultra filtration. On a closed loop system, increasing the rate of dumping of permeate will correct the situation on a day to day basis.
For more information write to us on
info@shinextechnologies.co.uk
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