chemistry

The components eluted from the g.c. columns are detected by a detector , which emits a proportional electrical signal (voltage). The detector of a gas chromatograph must have high sensitivity and reliability and a linear signal-concentration relationship over a wide range. Which are the properties that a gas chromatography detector must have? A list of these properties , in approximate order of importance, is as follows: sensitivity , stability , linearity , universality , selectivity , ease of use and cost . Sensitivity is usually defined as the response of the detector per unit concentration of analyte usually as mV mg -1 cm 3 . The sensitivity determines the slope of the calibration graph and therefore to some extent the precision of analysis. High sensitivity very often means a low limit of detection, which means that you will able to detect and determine very small quantities of analyte. Stability is the extent to which the output signal remains constant with time, given a ...