Flame emission working curves

It has been found, however, in practice that a perfectly straight analytical working curve (— log T plotted against concentration) is seldom obtained in atomic absorption spectroscopy. The reasons for this are usually a combination of instrumental problems broadening of the emission line of the light source due to self-reversal, Doppler and pressure broadening of the absorption lines of the atoms in the flame, failure to exclude flame emission entirely, use of a focused instead of a parallel... 

Here, Ihe emission occurs in llie blue wiih niaximii 111, W4 iind 1 )4 nni. The clieniMuniinescem intensity is proportional to the concenlralion of the excited sulfur dimer. Similarly, combustion of phosphorus compounds in a hydro.ccn flame gi es emission due to HPO at S2(i nm. Linear working curves over four decades of concentraiion arc reported. Both of these flame ehemiluntinescence techniques have been employed for detection of sulfur aitti phosphorus species in the effluent from gas chromatographic columns. 

The linear portion of the analytical working curve usually extends over a concentration range considerably greater than for atomic absorption or flame emission methods. Many working curves are linear over a concentration range of three to four orders of magnitude. The increased linearity is obtained primarily at low concentration levels, since detection limits are... 

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