Abstract
The loss of below 2 mg silver in cupeling was traced by use of radioactive silver, 110Ag.The experimental method consists of making a bead containing about 0.07 μc of 110Ag and determining the radioactivity of 110Ag in the bead and 110Ag in various parts of cupel after the cupellation for a direct determination of the loss by the absorption in cupel. This method made possible the making of a direct determination of the loss of silver in cupel, in a small amount which cannot be determined by the usual method and the tracing of silver in various parts of cupel is also possible. The result indicates that the loss of silver during the cupellation is exclusively caused by the absorption in cupel even when the amount of silver is small; and the smaller the amount of silver, the greater will be the loss of silver by the absorption in cupel.
