Abstract
In Part I a simple numerical model of the electron-capture detector (ECD) was described that could account with fair accuracy for the performance of the detector i the constant-current and constant-frequency methods of operation. In this paper, the model is extended to include the effects of electron loss by recombination and by reaction with trace amounts of contaminants in the carrier gas. These refinements appear to improve the predictions of the model to an accuracy of 5% or better. The practical problem of coulometric analysis with the ECD as its own standard is discussed. The environmental problem posed by the presence of atmospheric halocarbons demands an analytical accuracy of 3% or better. Teh theoretical considerations and practical experiments here reproted were made within the context of this need for improved accuracy. To meet it and also to validate the model of the ECD, an exponential dilution chamber was constructed and used to prepare in one step accurate standards with a parts per trillion (10 12) by volume concentration in air.
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