Use of Large Graphite Beakers in Double-Arc Analysis

Abstract

Large graphite beakers have been developed for analysis using the double-are technique. A two-chamber system prohibits the spraying of sample powder. The new beaker can be filled with more than 10 g of sample. The larger sample gives the advantage of better detection limits (to parts per billion). A new excitation and heating source, called “mixed source,” consisting of an exciting-spark or ac source and a separately controlled heating de arc, is described.