What is ion selective analyzer?
Ion selective electrode (ISE) is an analytical technique used to determine the activity of ions in aqueous solution by measuring the electrical potential. It is a real-time measurement, which means it can monitor the change of activity of ion with time. It can determine both positively and negatively charged ions.
What are ion selective electrodes used for?
Ion-selective electrodes (ISEs) are very similar in use to pH electrodes. They are used for chloride, potassium, calcium, carbon dioxide/carbonate, oxygen, and a variety of other ions. These methods are particularly suited for field analysis and online measurements.
How does an ISE work?
Principle of ion-selective electrode (I.S.E.) consists of a thin membrane across which only the intended ion can be transported. The transport of ions from a high conc. to a low one through a selective binding with some sites within the membrane creates a potential difference.
What is ISE instrument?
An ion-selective electrode (ISE), also known as a specific ion electrode (SIE), is a transducer (or sensor) that converts the activity of a specific ion dissolved in a solution into an electrical potential. The voltage is theoretically dependent on the logarithm of the ionic activity, according to the Nernst equation.
Which electrode is ion-selective electrode?
An electrochemical cell for making a potentiometric measurement with a membrane electrode (also known as an ion-selective electrode, ISE) is shown in Figure 1. As you can see the main difference between an ISE and the direct indicator electrode is in the ISE’s composition….Problems.
| [Pb2+] (mol/L) | E (mV) |
|---|---|
| ? | 145 |
What is an ion-selective electrode give examples?
The most important ion-selective electrodes for pH determination are glass electrodes, liquid membrane electrodes, and ion-sensitive field-effect transistors (ISFETs). Glass pH electrode. The glass pH electrode used to measure water acidity is the most common example of an ion-selective electrode.
What is ion-selective electrode give example?
Is ion-selective electrode accurate?
Ion selective electrodes (ISEs) can provide very accurate results, but care must be taken when using an ISE, as accurate results are dependent on proper calibration and use.
Which electrode is Ion Selective Electrode?
What type of ion is selective electrode?
Ion-selective electrode sensors have been classified according to the membrane type and include the following electrode classifications: (1) homogeneous crystalline membrane electrodes (e.g., LaF3 for F−, Ag2S for Ag+ or S2−, AgCl/Ag2S for Cl−); (2) heterogeneous crystalline membrane electrodes (e.g., silicone rubbers …
How does an ion selective electrode ( ISE ) work?
ION SELECTIVE ELECTRODES (ISE) ISE measures the ion activities or the thermodynamically effective free ion concentrations. ISE has a membrane construction that serves to block the interfering ions and only permit the passage of ions for which it was designed.
How is sodium ion measured with an ion selective electrode?
Sodium ion can be quickly measured directly with ion-specific electrodes, with about 1 % error, over a wide range of concentrations. A small sample is diluted with a small amount of ionic strength adjuster (ISA, an ammonium buffer solution) and the solution measured as if for pH, but in this case for p (Na+).
What are the advantages of using ion sensitive electrodes?
One advantage of working with ion sensitive electrodes (ISE), is the possibility of obtaining data using an economical alternative vs otherwise potentially expensive instrumentation. ISEs are electrochemical sensors that can be used directly in the mg/L range.
What makes up an ion sensitive measuring system?
An ion sensitive measuring system basically consists of the ISE reacting on a special ion type and a reference electrode that is jointly immersed in the sample to be measured (see figure below). Ref (reference electrode) and voltmeter.
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