narrow bandwidth instruments t h a t can discriminate between sites. For example, if the laser is tuned to the wavelength of the main intrinsic peak, the fluorescence spectrum shown in Figure 7a is obtained. If the laser is tuned to the wavelength of the first analyte peak, the fluorescence spec trum shown in Figure 7b is obtained. Note the complete absence of intrinsic fluorescence lines in the fluorescence of the analyte site.
the equilibria in the solid state. This requires a concentrated effort on each potential system to identify the condi tions appropriate for a successful pro cedure but offers the promise of a very sensitive and selective method for ul tratrace inorganic analysis. References (1) D. W. Johnson, J. B. Callis, and G. D. Christian, Anal. Chem., 49, 747A (1977).
(2) M. P. Miller, D. R. Tallant, F. J. Gustafson, and J. C. Wright, ibid., ρ 1474. Ci) D. R. 'l'allant and J. C. Wright, J. Chem. i'hys., 63, 2074 (1975). (4) F. J. Gustafson and J. C. Wright, Anal. Chem. 49, 1680(1977). (5) F. J. Gustafson and J. C. Wright, un published work. (6) J. G. Wright, Anal. Chem., 49, 1690 (1977). Work supported by the National Science Foun dation under ('.rant No. CHE 74-24H94.
Conclusions T h e concepts and methods present ed in this article are quite different from those concepts that are consid ered important in analytical fluores cence methodology today. We believe, however, that the method is very promising. T h e rare earth analysis procedure required a great deal of ef fort on one system (CaF^) to arrive at a final method, but its performance is truly excellent. One can establish a 1:1 correspondence between analyte and rare earth ion, and one can maintain very high selectivity for the particular analyte. We should therefore be able to realize the same excellent charac teristics for analysis of other ions as we have realized for rare earth analy sis. T h e success, however, will rest upon understanding and controlling
John C. Wright (left) is an associate professor of chemistry at the University of Wisconsin-Madison. His research interests include the spectroscopy of con densed phase materials, relaxation phenomena, and the application of laser technology to analytical chemistry. Frederick J. Gustafson (right) is currently a University of Wisconsin graduate student working for a doctorate and short ly will be joining the Minnesota Mining and Manufacturing Co. as a research chemist.
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1160 A · ANALYTICAL CHEMISTRY, VOL. 50. NO. 12, OCTOBER 1978
