# Characteristic Concentration and Sensitify

Hi,

Whats different Characteristic Concentration and Sensitifity?

on cookbook say:

sensitifity 324.8nm 1.5ppm = 0.2 Abs

and

Characteristic Concentration

Which one is more important before running AAS?

• Hi Dana

The way I was originally taught this was that the sensitivity in flame-aas referred to the concentration of that element that gave a signal of 0.2. The characteristic concentration is the concentration of that element equal to an absorbance of 0.0044 (99% T). As to which one is more important. To me characteristic concentration is more related to the detection limit though others may disagree. When carrying out analyses with flame-aas I always look at the sensitivity on the day verses that expected to get an idea of how the analysis on that day

Kevin