We are trying to see how the amount of ions such as Calcium, or Zinc change as 2-5 powders are mixed, dissolved and reacted. It is a thick, viscous mixture and we cannot use optical measurements as the mixture/reaction must be continually mixed. At the present we are considering ion selective electrodes for calcium, but the measurement time seems low (3-4 seconds to equilibrate). We want to get rapid (100-1000 milliseconds) concentration measurements. Does anyone have experience with the ion selective electrodes, or a suggestion for equipment or a technique that might be suited for this? Thank you in advance!!
Dear Mr Palmer, in equilibrium conditions, ion selective electrodes (ISE) can response from 3 to 4 seconds or more. But, using methods suitable to measure the real time of response of ISEs containing polimeric membranes, researchers found a time from 20 to 100 ms. See the article: Pungor, E. The Theory of Ion-Selective Electrodes, Analytical Sciences, April, 1998, 249-256. In this article, Prof. Pungor shows a device for measuring the real time of response of ISEs. The device is not simple. I hope that this answer helps you. Good lucky.
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