Spectrographic Determination of Copper in Wheat and Soil (Classic Reprint) - Hardcover

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Excerpt from Spectrographic Determination of Copper in Wheat and Soil

Although there is a gain in sensitivity when the sample is arched on the negative electrede, the arc is more uniform and reproducible when the anode contains the sample. The high temperature of the electrodes melts the sample into a bead in the anode crater, and if the upper electrode is pointed, the are strikes directly into this bead. Pierce, Torres, and Marshall (15) have found that the cathode are vaporizes more carbon and hence causes more background formation on the plate by wandering about the rim of the crater. From these considerations the anode are was chosen for the discharge method in this work.

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