Effect of Evaporated Films on Recovery of Gases Evolved during Vacuum Fusion Analyses

Critical Evaluation of a Platinum-Bath, Vacuum-Fusion Procedure for the Determination of Oxygen and Nitrogen in Steels.

“…The lower oxygen values obtained at 2150°C. suggests appreciable gas gettering by the metal vaporized during analysis (2,17) at this elevated temperature. The data shown for nitrogen confirm the work of Masson and Pearce (15) since improved nitrogen recovery was obtained by increasing the iron bath temperature to 2150°C.…”

Comparative Study on Determination of Oxygen in Vanadium Metal.

“…Sorption of the evolved carbon monoxide on these deposits may lead to serious systematic errors (2).…”

“…Further substantiation of the absolute analytical accuracy is evident in the high degree of correlation between oxygen content, as measured by these procedures, and the lattice 1366 The molybdenum blue color developed by reducing heteropoly compounds, such as ammonium molybdophosphate or molybdosilicate, has been extensively used for spectrophotometric determination of phosphates or silicates (1,2, 5-9, IS). Because the absorption spectrum of the phosphatemolybdenum complex is similar to that of the silicate-molybdenum complex (2), special attention must be given to the interference of phosphate or silicate in determinations of either anion by the spectrophotometric method.…”

“…Present address, Department of Chemistry, Montana State University, Bozemont, Mont 2. Present address, Anaconda American Brass Co., Waterbury, Conn.…”

Studies on the D.C. carbon arc, gas-chromatographic technique for the determination of gases in metal

“…This is especially important if spectroscopic measurements are to be made with the chamber. A quartz window is located in each of the five circular or trapezoidal ports [8] in the electrode stage and is retained by a Teflon (DuPont) tipped setscrew [9], All windows, with exception of the portion in line with the electrode in arcing position, are protected from deposits by a stainless steel shield [10].…”