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Mineral acids are often added to samples prior to flame spectrometric determinations. Mineral acids produce enhancement and suppression of analyte slgnals In laser-enhanced loniratlon (LEI) spectrometry. Thls paper characterizes these effects, examines them in detall, and provides explanations for the observed slgnal behavior. The addition of nitric acid to standard and sample solutions is suggested as a means of improving LEI signals while preventing adsorption on container walls durlng storage.

Recent studies (2,2) have demonstrated that an electrode positioner is necessary for optimization of the laser-enhanced ionization (LEI) signal. In LEI spectrometry, a dye laser tuned to a discrete absorption transition of an analyte atomized in a flame enhances the thermal (collisional) ionization of the analyte atoms. The laser-related increase in ionization is

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Resonance detection and quantification of atomic absorption have been demonstrated for Na, Cu, and Li using an optogalvanic effect. In this experiment, a pulsed dye laser tuned to an absorption transition of the analyte atom (i.e., the element to be determined) was directed through the analyte atomic vapor produced in a flame into a commercial hollow cathode lamp containing the element of interest. The optogalvanic signal was monitored and related to the analyte concentration in the flame. Detection limits were obtained for Na, Cu, and Li, the behavior of the sodium hollow cathode lamp was characterized, and future applications are suggested.