Performance data are presented for several elements determined by atomic-absorption flame photometry with the use of a high sensitivity nitrous oxide—acetylene burner. Utilizing the specific advantages of this flame, the effect of gas mixtures, feeding rate, and the height of reaction zone on the sensitivities achieved are presented. Flame profiles of several elements studied will be discussed with emphasis on using multiple-pass optics for increased sensitivities. Information will be presented on the problems of this type of flame. Results are presented in terms of the precision and accuracy of routine determinations under selected optimum system conditions and will be discussed.
Percentual Concentration Limit (PCL): Concentration in ppm of analyte giving a signal corresponding to 1% absorption, under given operating conditions. Fluctuational Concentration Limit (FCL): Concentration in ppm of analyte giving a signal corresponding to the peak-to-peak noise obtained at 0% absorption level (blank adjusted at 0% absorption), under given operating conditions. Absolute Limit (AL): Amount of analyte expressed in grams (or in a fraction of a gram) detectable in the experimental conditions at which the fluctuational concentration limit is calculated. In order to calculate absolute limits, the sample consumption (in ml/min) and reading time (in sec) should be known. It is supposed that the solution is aspirated along the reading time.
