Characteristic Concentration of an element has been
defined as its concentration in solution which
produces a change, compared with pure solvent, of
0.0044 absorbance units (1% absorption) at the
wavelength of the absorption line employed.
The “characteristic concentration” (sometimes called sensitivity) is defined as the concentration of an element (mg L -1) that will absorb 1 % of the incoming radiation. This equals a signal of 0.0044 absorbance units (AU)