Abstract
A method has been developed for the determination of tin in steel based on the atomic fluorescence of tin at the 303.4-nm line in an argon-separated air-acetylene flame (detection limit 0.05 p.p.m.) or argon-oxygen-hydrogen flame (detection limit 0.01 p.p.m.). A temperature-controlled, electronically modulated electrodeless discharge tube was used as the source. The effects of interferences were eliminated by addition of iron(III) chloride to the calibration standards in about the same amount as found in the sample and by removal of silicon from the sample. The preferred procedure involves dissolution of the sample in aquaregia followed by either the volatilization of silicon tetrafluoride or filtration of silicic acid. Tin can be determined in steels without any preconcentration step.
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