What is ion-selective electrode and explain its working?
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.
What are the advantages of ion-selective electrodes?
ISE has many advantages compared to other techniques, including: It is relatively inexpensive and easy to operate. It has wide concentration measurement range. As it measure the activity, instead of concentration, it is particularly useful in biological/medical application.
What are ion selective electrodes give examples?
Ion selective electrodes(ISE) • – Also known as indicator electrodes • – Respond directly to the analyte • – Used for direct potentiometric measurements • – Selectively binds and measures the activity of one ion (no redox chemistry) Examples • pH electrode • Calcium (Ca2+) electrode • Chloride (Cl-) electrode.
What is electrode classification?
The welding electrodes are classified on the basis of the electrode metal, flux coating, current used, position of welding, performance characteristics, chemistry and the mechanical properties of the weld metal etc.
What is electrode angle?
An electrode’s travel angle is measured in a plane defined by the weld axis and the electrode axis. The travel angle is the angle measured between the axis of the electrode and the axis of an imaginary line perpendicular to the weld axis.
What is the principle of ISE?
Principle of ion-selective electrode (I.S.E.) An ideal 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 are the limitations of ion-selective electrode?
The three main limitations on Ion Selective Electrode measurements are the effect of interference from other ions in solution, the effect of the ionic strength of the solution reducing the measured activity relative to the true concentration at high concentrations, and potential drift during a sequence of measurements.
What is Biomembrane electrode?
Biomembrane electrodes are similar in design to gas-sensing electrodes. The outer permeable membrane is used to hold a gel between the two membranes. The gel contains an enzyme that selectively catalyzes the reaction of the analyte.
What is electrode code?
The “E” indicates an arc welding electrode. The first two digits of a 4-digit number and the first three digits of a 5-digit number stand for tensile strength. For example, E6010 means 60,000 pounds per square inch (PSI) tensile strength and E10018 means 100,000 psi tensile strength.