Liquid Chromatography Detectors - Dispersion in Detector Sensors > Dispersion Resulting from the Detector Time Constant > Page 15

Dispersion Resulting from the Detector Time Constant

 

In addition to the sources of dispersion so far discussed, the peak can appear to be further dispersed by the combined time constant of the sensor and its associated electronics. It must be emphasized that the time constant of the system can not actually disperse an eluted peak, but its effect of it on the sensor measurement can produce an apparent peak dispersion. Thus the term appear is used as the solvent profile itself is not changed, only the profile as presented on the recorder or printer.  The effect of the detector time constant can be calculated and the results from such a calculation are shown in figure 9.

 

Figure 9. Peak Profiles Demonstrating Distortion Resulting from Detector Time Constant