As a student, you may have learned about the concept of an ion-selective electrode (ISE). But what is it, and how does it work? This article examines the core concepts of ISE technology. In this blog, we shall discuss the need for ISEs and also provide tips on how to choose a suitable ISE for your use-case. We will also look into some common challenges encountered by users of ISEs and tips on how to resolve them for generating accurate measurements.
An ion-selective electrode (ISE) is a specialty instrument, used to sense the concentration of a specific ion (such as Na+ or Cl−) in a solution (e.g., water). It consists of two primary components: the reference electrode, and the measuring electrode. The hitting electrode has a brand new coating that can work together with one specific ion, so it will only target that specific ion, not any of the ions in the solution. It also has a coating, this reference electrode, but a coating that does not react to any ion at all. These two electrodes work in duo to assist with the measurement of the ion concentration you are measuring.
An ISE creates an electrical potential that differs only by the concentration of that specific ion in solution. So what's the difference between those two points — that is measured as volts using a device called a voltmeter. The voltmeter data is performed through a mathematical calculation, the Nernst equation to convert to a concentration value. This process allows scientists and researchers to take readings with the correct relative ion concentrations.
Compared to other methods to measure ions, ISEs have many advantages. This opens the door to one of their greatest advantages, which is their ability to scan for specific individual ions without interference from other ions present in solution. Use of ISEs means that a clear reading can be obtained in complex solutions such as blood or soil where multitude of different ions may exist.
ISEs are employed to maintain pH levels in many applications of interest, for instance in water treatment facilities and food manufacturing. This way, workers can quickly adjust the chemical composition of the solution to keep it at a pH level they want by measuring the pH of a solution in real-time. This is vital since monitoring the proper pH can impact everything from drinking water safety to food-grade products quality.
The next thing you want to think about is the type of sample you have. Additionally, different samples can be more difficult than others to measure, which may require you to select an ISE that has been specifically designed for that sample type. For instance, the conductivity of seawater, which has a high salinity, may cause interference during measurements, in which case a specific electrode may be needed to result in a quality reading.
Ise is a pretty reliable user friendly ainda, but there are a few common problems that may occur. One common problem is known as electrode drift. That means that the readings from the electrode are no longer giving an accurate picture of the ion concentration as they change over time. Athreos, “Drift in Electrochemical Computational Measurements: A Paradigm to Mitigate the Effects of Robot Remote Sensing,” 10) It is critical that the manufacturer’s recommended storage / maintenance procedure be closely adhered to in order to mitigate electrode drift.
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