is appropriate for samples prepared by other methods. Finally, it is proposed that the desired properties of the BPSG film such as reflow angle and dielectric properties might be estimated from the IR spectra using these multivariate calibration methods. Physical properties (including softening temperature and thermal expansion coefficient) of bulk glasses have previously been estimated from their IR spectra using PLS methods (28). Future studies in this laboratory will focus on addressing these points. ACKNOWLEDGMENTThe author acknowledges . T. Kay and G. R. Iben for providing the BPSG samples. A. R. Mahoney made the ellipsometer measurements, M. Gonzales and W. B. Chambers performed the ICP analyses, and R. M. Merrill conducted the IC analyses. C. E. Case collected the IR data and aided in the computer analysis of the spectral data. E. V. Thomas, R. B. Pettit, and H. L. Tardy contributed with helpful discussions.

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Electrothermal vaporization isotope dilution inductivelyconcentrations of Cu, Cd and Pb in several biological samples.The pyrolytic graphite platforms of the graphite tubes were coupled plasma mass spectrometry ( ETV-ID-ICP-MS) was applied to the determination of Cu, Cd and Pb in several pretreated with palladium to delay the Cd vaporization by three different methods, thermal pretreatment, electroplating biological samples. The isotope ratios for each element in each analytical run were calculated from the peak areas of each and sputtering, and the analytical characteristics of these pretreatment methods were compared. The influences of non-isotope. Various chemical modifiers were tested to obtain the optimum signal of cadmium and palladium was selected. The spectroscopic and spectroscopic interferences resulting from the matrix on the accuracy of isotope ratio determination were pyrolytic graphite platforms of the graphite tubes were then pretreated with palladium by three different methods, thermal also investigated. The ETV-ID-ICP-MS method was applied to the determination of Cu, Cd and Pb in dogfish liver reference pretreatment, electroplating and sputtering, and after careful evaluation of the analytical performance of these methods, material DOLT-1, dogfish muscle reference material DORM-1 and freeze dried urine standard reference material NIST thermal pretreatment of the platform with Pd before each analysis was selected. The ETV-ID-ICP-MS method was SRM 2670. applied to the determination of Cu, Cd and Pb in dogfish liver reference material DOLT-1, dogfish muscle reference material EXP ERI MEN TAL DORM-1 and freeze-dried urine standard reference material NIST SRM 2670. The results agreed satisfactorily with the Apparatus and Conditions certified values.

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