Abstract
Palladium, about 5–10 μg as Pd (NO 3) 2, is confirmed as an effective matrix modifier for Tl. A pyrolysis temperature of 1000°C can be used, which is a much higher temperature than could be used with the previously proposed matrix modifier, H 2SO 4. The recovery of Tl was quite good in the presence of large amounts of NaCl but was inadequate in the presence of KCl. Abandoning the pyrolysis step and the matrix modifier proved to be convenient for determining Tl in both an NaCl and a KCl matrix. Thallium was fully recovered in these matrices in the presence of about 30μg of either salt, or about 0.15%, assuming a 20μl sample.
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