“…For the determination of molybdenum in ferrous materials at concentrations down to about 1 ppm, Pometun and Sinyakova (486) employed fluorination reactions for the preferential volatilization of molybdenum. For the analysis of uranium compounds, Kelen and Vorsatz (301) combined differential volatilization in an ac arc with a scanning mirror to permit the measurement of partially-resolved lines in the spectrum.…”