A semiautomated method for the determination of tin in suspended air particulate matter is described. The dissolved tin is reacted with sodium borohydride solution and converted Into gaseous hydrides. The resulting gaseous mixture is combusted in a tube furnace and the atomic absorption of tin is measured at 286.3 nm. More than 20-fold concentrations of copper, nickel, antimony, and arsenic interfere. The interferences are eliminated by the addition of sodium oxalate to the sample solutions or by prior coprecipitation with hydrated manganese dioxide. Fifty Hi-Vol air filters can be analyzed per day. The relative standard deviation of the method is 6% with a sensitivity of 0.45 jug/l. and a detection limit of 0.1 /ug/l.
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