Abstract

A two-stage graphite atomizer with an independently heated tungsten probe has been investigated by shadow spectral visualization, which is a promising method for analyzing the direct atomic absorption of complex substances. Fall-offs in optical density of the formed Ag, Fe, and Al vapors and smoke are measured. The dependences of the shape and size of the analytical pulses of absorption on the size of the photometric zone in a graphite furnace, and on the photodetector type (multipixel photodetectors with spatial resolution and a simple photomultiplier), are established. It is shown that the multipixel photodetectors recommended earlier for one-stage atomization exhibit some advantages. However, for analytical purposes, this probe atomizer can be used successfully with a photomultiplier or photodiode.

© 2019 Optical Society of America

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