Abstract
An X-ray fluorescence spectrometric method has been developed for the rapid analysis of granular silver dental amalgam alloys having the nominal composition, in per cent, of: silver 69, tin 26, copper 4, and zinc 1. Several methods of specimen preparation were investigated; a method employing briquettes pressed at 1400 kg cm 2 without binder was the most satisfactory. Analytical curves relating intensities of K α lines to concentrations of silver, copper, and zinc were linear, but no calibration curve could be obtained for the tin K α line due to line interference from the silver K β emission. To correct for this interference, the ratio of intensities (Sn K α + Ag K β)/Ag K α was plotted versus the ratio of concentrations Sn/Ag, producing a linear analytical curve. Observed typical coefficients of variation for the method were Ag 0.4 per cent, Sn 0.8 per cent, Cu 3 per cent, and Zn 0.6 per cent.
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