SEDL / STP / STP742-EB / STP28282S

High-Purity Water Quality Monitoring Based on Ion-Selective Electrode Technology

Diggens, AA
Vice president, Industrial Products, international marketing manager, director, Applications Research, and project engineer, Orion Research, Inc., Cambridge, Mass.

Lichtenstein, S
Vice president, Industrial Products, international marketing manager, director, Applications Research, and project engineer, Orion Research, Inc., Cambridge, Mass.

Synnott, JC
Vice president, Industrial Products, international marketing manager, director, Applications Research, and project engineer, Orion Research, Inc., Cambridge, Mass.

West, SJ
Vice president, Industrial Products, international marketing manager, director, Applications Research, and project engineer, Orion Research, Inc., Cambridge, Mass.

Pages: 8    Published: Jan 1981

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Abstract

Power industry requirements for pure water demand instrumentation capable of detecting contaminants at very low levels. Moreover, precision and accuracy of measurement should be improved to allow reliable control. Although ion-selective electrodes have been employed successfully in the laboratory, certain problems have inhibited their utility in on-line monitoring applications. Recent work, briefly reviewed here, discusses these problems as encountered in the development of a sodium monitor. This effort has resulted in a second generation of ion-selective electrode-based devices which are less complex and, therefore, more reliable. Among these are monitors that measure chloride, chlorine, calcium, and sulfide in the parts-per-billion range. Hardware and chemistries are described, and data resulting from in-house and field evaluations are discussed. Work in progress for other parameters is presented.