A rapid method for determining tin and molybdenum in geological samples by flame atomic-absorption spectroscopy.
The proposed method uses a lithium metaborate fusion, dissolution of the fusion bead in 15% v v hydrochloric acid, extraction into a 4% solution of trioctylphosphine oxide in methyl isobutyl ketone, and aspiration into a nitrous oxide-acetylene flame. The limits of detection for tin and molybdenum are 1.0 and 0.5 ppm, respectively. Approximately 50 samples can be analysed per day.
Welsch
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U.S. Geological Survey, Box 25046, Denver Fedral Center, MS 973 Denver, Colorado 80225, USA.