Spectrochemical Analysis of Nonmetallic Samples. Pellet-Spark Technique with Multichannel Photoelectric Spectrometer

Emission Spectroscopy

“…Two books were published on rock and mineral analysis, a general treatment by Katchenkov (127) and a treatise on the determination of alkali and alkaline earth elements by Borovik-Romanova (32). Various nonmetallic samples are analyzed with a photoelectric spectrometer by Tingle and Mat ocha (256). In this method the sample is fused with an alkaline flux and pelleted with graphite; a precision to 1 to 2% is reported.…”

Second report on a cooperative investigation of the composition of two silicate rocks

“…The resulting mixture was formed into a pellet, ~ inch in diameter, at a gauge pressure of 20,000 pounds. Excitation and exposure conditions are those listed in table 1 of the article on the method (Tingle and Matocha, 1958) with the exception that the determination of MnO in W -1 and G-1 and TiO~:, 1fe 2 0 3 , and MgO in G--1 were made using an inductance of 180 mierohenrys and an exposure period of 10 seconds.…”