Determination of Tin in Ploy Metallic Ores by Hydride Generation Atomic Fluorescence Spectrometry

A method for the determination of tin in ploy metallic ores by hydride generation atomic fluorescence spectrometry has been developed.Twice coprecipitation with ferric hydroxide was used to separate tin from copper,lead,zinc etc.. Tin in sample solution was then determined by hydride generation atomic fluorescence spectrometry in acid medium with tartaric acid-thio urea-ascorbic acid as a masking reagent. The detection limit of the method is 0.20 μg/g for tin. Recoveries of tin were 88.6%～113.0% with precision (n=12) of 6.5% RSD and 4.0% RSD for the samples with w(Sn)=7.47 μg/g and w(Sn)=21.6 μg/g respectively. The method has been applied to the determination of tin in standard reference materials with satisfactory results.