MOLECULAR ABSORPTION WITH ELECTRO-THERMAL VOLATILIZATION IN A GRAPHITE TUBE .3. STUDY OF THE DETERMINATION OF FLUORIDE TRACES BY ALF, GAF, INF AND TLF MOLECULAR ABSORPTION

Molecular absorption with electrothermal volatilization in a graphite tube. Part 3. A study of the determination of fluoride traces by A1F, GaF, InF and T1F molecular absorption. The use of the molecular absorption of thermally stable molecules such as AlF, GaF, InF and TlF, generated in a normal graphite tube, is assessed for determinations of fluoride. Optimal experimental conditions are discussed. The presence of Na+ ions increases the signals. The influence of Na+ ions and of other substances is discussed. The sensitivities (0.01 absorbance) are 0.4 ng F- for AlF, 0.8 ng F- for GaF, and 1.1 ng F- for InF. © 1979.