Abstract
Direct-reading emission spectrometry is an excellent method for the rapid and precise analysis of many elements in rocks. By using an interrupted discharge for excitation, such as a high-voltage spark or condensed arc, it is possible to determine both major and trace elements, simultaneously if desired. To fully utilise the speed of the multichannel photoelectric spectrometer, it is desirable to automate sample preparation to as great a degree as possible and carry out the necessary computations by digital computer. Details are given for three methods that have been developed to determine: 1. (1) Major elements in a variety of rocks. 2. (2) Major and trace elements in a variety of rocks. 3. (3) Major and trace elements within a single rock type.
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