On the Behaviour of Silver in Cupellation using <SUP>110</SUP>Ag

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  • 放射性銀を用いた試金分析における銀の灰吹挙動について
  • ホウシャセイギン オ モチイタ シキン ブンセキ ニ オケル ギン ノ ハイフキ キョドウ ニ ツイテ

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Abstract

By using radioactive silver, 110Ag, the mechanism of cupellation was studied. The absorption loss of silver into the cupel in cupellation process was traced when silver amount in the lead button was small, and its distribution in the cupel was also traced. The vaporizing loss was determined directly. The results are as follows:<BR>(1) Silver in the buttons is absorbed and diffused into the cupel with molten litharge according to the distrbution equilibrium of silver between molten lead and litharge in cupellation process.<BR>(2) At the finishing period of cupellation, silver is absobed irregularly in the cupel, This loss is greater in the following cases, when temperature is high, silver amount is low, ratio of gold to silver is small, and the surface condition of cupel is not good.<BR>(3) The vaporizing loss of silver in cupellation is less than 0.06%, being negligible.<BR>(4) In the cupellation process, the loss of (1) is inevitable, so the greatest care should be to taken to eliminate the loss of (2).

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