432
Anal. Chem. 1987, 59, 432-436
was used. These results agree well with the values of 63 f 7 ppb certified for the former ore and approximately 110 ppb for the latter. Excitation of the rl (Tlg) rl ('Al 1 v4 transition at 614.5 nm and observation of the rl ('Alg) ) v4 transition at 753.9 nm prevented interference from Ptf+ when the RbzSnBrahost was used.
-
(%rl
+
CONCLUSIONS The methods described in this paper require ca. 12 h of sample preparation for four samples by an experienced analyst. The methods are appropriate for the determination of Re and Os present a t low parts per billion concentrations in geological materials. Although the SEPIL technique itself has demonstrated ppt detection limits in solution (12,18,19),the need to decompose a solid sample introduces a dilution factor of at least 100. These characteristics can be improved by those concerned with routine analysis. It should be noted that a small sample size (
