乾式試金における共存元素の影響
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In fire assaying of Au and Ag in ore, we certified the extents of errors caused by some coexistent elements. Samples were treated by standard crusible fusion and the lead buttons obtained were cupelled and parted ordinarily. Results are as follows.<BR>(1) Suitable weight of lead button is 2535 g. Smaller button results in smaller recovery of Au and Ag.<BR>(2) The influence of Cu content in lead button less than 2 g is negligible. But the existence of Cu more than 3 g makes the cupellation impossible. Metallic Cu in sample melts mostly into lead button.<BR>(3) The content of Zn in sample increases the slagloss. Zn is practically not contained in lead button.<BR>(4) The considerable portion of Ni content is absorbed in lead button. The content of Ni in lead button less than 0.025 g causes negligible error, but that more than 0.03 g makes the cupellation impossible.<BR>(5) Te shows rather complex influences. The most part of Te remains in lead button. The existence of Te in lead button increases the cupellation-loss and that more than 1 g makes the formation of bead impossible. On the other hand, some of Te remains in bead when the content is more than 0.2 g.<BR>(6) Se similarly decreases the recovery of Au and Ag and the content more than 5 g makes impossible the formation of bead. But its influence less than 0.5 g is negligible.<BR>(7) The Bi content in sample less than 0.2 g gives negligible influence, but that more than 0.2 g increases cupellation-loss.<BR>(8) The content of As and Sb in lead button less than 0.5 g does not cause any error.
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