A new method of empirical calibration has been developed using matrix Ion species ratios to calibrate elemental sensitivity factors from external standards. A series of sensitivity factors Is generated as a function of sample chamber oxygen pressure using an oxygen leak system. The method Is applied to the analysis of three different metal matrices: steels, aluminum alloys, and copper alloys. The accuracy achieved with the method Is on the order of 10% relative error.

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technique for quantitative analysis for trace amounts of arsenic. Comparison of detection limits (Table III) demonstrates that the ESCA-volatilization technique is quite competitive with other trace analytical methods. Likewise, our analytical method shows both good accuracy and precision.Further, volatilization can be performed in the field making remote sampling facile. The possibility of doing quantitative simultaneous multielement analysis at trace levels also has been demonstrated. ACKNOWLEDGMENTThe authors express their gratitude to F. W. Plankey and E. M. Heithmar for loan of the atomic absorption standards and for some helpful discussions; also to S. Erickson for her assistance. LITERATURE CITED(1) T. A. Carlson, "Photoelectron and Auger Spectroscopy", Plenum Press.

A computerized vidicon flame spectrometer is described along with Its application to a simultaneous determination of four serum electrolytes. Data acquisition, transfer, storage, and manipulation have been greatly improved by the computer addition. Operator input has been minimized while the programming has incorporated such features as automatic least-squares polynomial curve fitting, "spectral stripplng", background corrected peak signal measurements, and internal standard corrections.

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