Abstract
In part I of this work an analytical procedure was presented for the capillary gas chromatographic determination of volatile hydrocarbons in gases. Here, various quantitative aspects of GC analysis and Electron Capture Detection are emphasized. The performance of several types of capillary columns is studied and a compromise is suggested between column inner diameter, film thickness, stationary phase and oven temperature. The influence of several experimental parameters like pulse voltage, standing current and the detector temperature on the quantitative results of EC detection are discussed. ECD calibration by coulometric detection in the Constant Frequency mode is compared to Constant Current EC detection using gas standards. The gas standards were prepared either by static or dynamic dilution procedures. Accurate and highly reproducible concentrations between ppm's and ppb's were obtained by a newly designed permeation gas system, of which a detailed description is given. The applicability of the total procedure is demonstrated by the quantitative analysis of a series of stratospheric air samples collected at altitudes between 10 and 30 km.
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