State Ion Selective Electrodes Research Articles

Microelectronic approaches to solid state ion selective electrodes*

The application of microcircuit production techniques to the construction of ion-sensitive devices is discussed. A qualitative model for the operation of the Ion Sensitive Field Effect Transistor (ISFET) is presented. Alternative devices to the ISFET, also based on microelectronic methods, are proposed.

Microdetermination of chlorine and bromine in some organic compounds by ion-selective electrodes

The solid state ion-selective chloride and bromide electrodes are used for the microdetermination of chlorine and bromine in organic compounds. After combustion in an oxygen-filled flask, potentiometric titration with silver nitrate at pH 5–7 in presence of 50% dioxan is carried out. Results accurate to ±0.3% absolute are obtained with some partially and highly halogenated compounds.

“In Situ” Use of the Ion Selective Electrode, the Selectrodetm, in Studies of Soil-Plant Relationships

Abstract Embedded in soils or immersed in a soil/solution system solid state ion selective electrodes, the Selectrodes, were used in continuous measurements of the activities of hydrogen, chloride and copper (III) ions of the solution phase. The total copper (II) concentration of the solution phase was assayed by the standard addition technique. Cation exchange isotherms were directly obtained by means of two pH-Selectrodes, one of which being charged with the exchanger material. The potentialities of “in situ” use of Selectrodes in soil-plant relationship work are emphazised. Great interest have recently been focused on the application of ion selective electrodes for “in situ” measurements in aqueous systems. Thus, fluoride electrodes are currently being used for monitoring the fluoride level in fluoridated water supplies, and at the Woods Hole Oceanographic Institution a device for continuous measurement of marine fluoride/chlorinity profiles have been constructed1. Although of inherent importance, no a...