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TEST AND EVALUATION OF POTASSIUM SENSORS IN FRESH AND SALTWATER
Citation:
Ward, G. TEST AND EVALUATION OF POTASSIUM SENSORS IN FRESH AND SALTWATER. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/7-79/057 (NTIS PB299266), 1979.
Description:
Three types of potassium ion-selective electrodes were evaluated for suitability in monitoring or in-situ measurement applications. Each sensor was tested for the following parameters: accuracy, precision, temperature dependence, short and long-term stability, durability, sensitivity to variations in light intensity and flow conditions, response time as a function of temperature and potassium concentration, and variations between different manufacturers. The three potassium sensors (glass-membrane single electrode, glass-membrane combination electrode and liquid ion-exchange electrode) were evaluated at 10C and 25C in freshwater, synthetic seawater and natural seawater (35-, 20- and 5-ppt salinity). A description of the devices, the theory of their operation, and a summary of the test results are included.