Abstract
A description of a commercially available micro-adsorption detector (Varian) is given. Detector response was monitored by a digital data logging system producing a paper tape. This digital data was analyzed using a DEC PDP-8/I. Investigation of the mechanism of response showed the detector response to be a complex function of both adsorption and desorption processes. This contradicts the earlier published conclusions: (a) that the peak response was merely the differential of the sample concentration profile and (b) that the positive peak was due only to adsorption processes and the negative peak was due solely to desorption processes. The investigation and results are discussed in this paper. Correlation between sample size and (a) the first half of the positive peak area, (b) total peak area, (c) total negative peak area, and (d) total peak area were tested. Statistical analysis of the detector response showed that only the first half of the positive peak area was proportional to sample concentration. For quantitative analysis it was also shown that total peak height, or positive peak height could also be used. This work is discussed in Part II of this series.
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