John McCaffrey - Extension of working range in Zeeman graphite furnace atomic absorption spectrometry by nonlinear calibration with prior correction for stray light.

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      Lonardo, R.F.; Yuzefovsky, A.I.; Zhou, J.X.; McCaffrey, J.T.;   Michel, R.G. , Extension of working range in Zeeman graphite   furnace atomic absorption spectrometry by nonlinear calibration   with prior correction for stray light. Spectrochim. Acta. 1996,   51B, 1309-1323.


      The nonlinear working range of a Perkin-Elmer 4100Zl atomic   absorption spectrometer was improved in three steps. Firstly,   each absorbance datum within the transient profile was corrected   for the presence of stray light by an algorithm originally   developed by L'vov and co-workers (Spectrochim. Acta Part B, 47   (1992) 889–895 and 1187–1202), but with the incorporation of the   Newton method of successive approximations (Spectrochim. Acta   Part B, 49 (1994) 1643–1656. Secondly, a dip correction procedure   was performed on temporal signal profiles that exhibited a dip   due to rollover. In the final step, an analytically useful   working curve was generated by the nonlinear calibration routine   of Barnett (Spectrochim. Acta Part B, 39 (1984) 829). Goodness of   fit between the resultant calibration curve and the data was   measured by the method suggested by Miller-Ihli et al.   (Spectrochim. Acta Part B, 39 (1984) 1603) that is based on the   sum of squares of the percentage deviation (SSPD) and the root   mean square (RMS) percentage deviation. For lead, silver, copper,   thallium, and cadmium, the analytical nonlinear working range was   increased by as much as one and a half orders of magnitude,   without any significant effect on the RMS. For chromium and   manganese, no significant improvement in the nonlinear working   range was observed, while the RMS improved by 50%. In the case of   nickel, neither the working range nor the RMS was improved.


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