The electrolytic migration of lead and thallium in potassium chloride crystals to which small additions of lead chloride and thallous chloride have been made has been studied in a transference experiment. Lead was found to migrate toward the anode, indicating that it is bound in a negatively charged complex. Thallium did not migrate appreciably at temperatures below 600°; at higher temperatures it moved toward the cathode. Thallium clearly may exist as the simple cation at elevated temperatures; however, the results at lower temperatures do not permit a conclusion to be drawn with certainty regarding the existence of complex ions.
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