Do the IQ non-glass pH Systems work in low ionic strength samples?
(This question is asked because typically glass probes have not shown very good response in low ionic strength solutions). As the ionic strength of a solution decreases, any pH measurement technology will demonstrate declining response capabilities. However, since IQ Scientific Instruments silicon chip sensor relies on surface effects rather than membrane diffusion effects to obtain a reading, the performance of the silicon chip sensor will be as good, if not better, than glass probes. Low ionic strength samples are an extremely difficult application for any type of pH probe. A gentle stirring action with the probe during measurement will help to achieve a stable reading. Special low Ionic Strength (LIS) probes are available in all model probes.
