Abstract
savvin's reagent, arsenazo III, has been examined for the determination of traces of thorium in rocks. The superior sensitivity and selectivity of the arsenazo III reaction, over the thorin reaction have been confirmed. Sensitivity and stability have been improved by working in a perchlorate medium. Anomalous effects were observed in the presence of relatively large amounts of titanium. Silicate samples are decomposed by rafter's peroxide sinter, the sinter cake leached with water, and the residue dissolved in acid. Thorium is collected on a calcium oxalate precipitate, and determined photometrically in perchloratc medium at 660 mm. The normal working range is 0 to 25 μg of thorium on a 0.5-g sample.
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