1982 Volume 31 Issue 9 Pages T70-T74
In order to expand linearly a dynamic range of response from a gas chromatography, the response of a constant-frequency electron capture detector was converted by an analog device, and the result was applied to a programmed temperature operation. The response showed the linear dynamic range of 103 or above by using pulses of the 2000 μs period. On the other hand, it was found that the ordinary ECD to be considered as a concentration-sensitive detector showed a function of mass-sensitive one according to the relation between the pulse period and the kind of electron capture reaction occuring within the cell. On supplying pulses of the 100μs period, the ECD acted as a concentration-sensitive detector for α-BHC, β-BHC, γ-BHC, δ-BHC, and p, p-DDE, and as a mass-sensitive one for p, p'-DDT. On supplying pulses of the 2000μs period, the ECD acted as a mass-sensitive one for all samples described above. Since it is preferable in programmed temperature operation that the ECD acts as a mass-sensitive detector in which the peak area of sample is independent of the flow-rate, the pulse of 2000μs period has been adopted for the present study. As the result, fairly good programmed temperature operation has been carried out.
