Abstract
A quartz plate (20×10×2mm), made to vibrate at ca. 100 Hz, was mounted behind the entrance slit of a monochromator to scan a narrow wavelength region (max.: 0.33 nm) repetitively. Spectral signals synchronized with the scan were accumulated on a minicomputer for the pre-determined number of times. The rate of accumulation was about 12000 per min., After the data acquisition, the spectrum was displayed on a strip chart recorder. The method was applied to the detection of metals at low ppb levels in solutions with a low-wattage microwave torch discharge. With a 2-min. accumulation, detection limits were lowered by an order of magnitude as compared with the results measured with a lock-in amplifier. The system was also applicable to the simultaneous measurement of adjacent spectral lines lying as near as 0.05 nm.
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