[Determination of tin dioxide in workplace air by atomic fluorescence spectrometry after alkali fusion].

OBJECTIVE

To establish the method of atomic fluorescence spectrometry (AFS) after alkali fusion for determination of tin dioxide in workplace air.

METHODS

Tin dioxide in workplace air was collected with microporous membrane, directly digested by alkali fusion with solid sodium hydroxide heated by electric furnace, and determined by AFS.

RESULTS

The linear range of tin dioxide (as Sn) determined by AFS was 1.5~100 μg/L (excluding zero) , and the correlation coefficient was 0.9993. The detection limit of this method was 0.5 μg/L, the lower limit of quantification was 1.5 μg/L, and the minimum detectable concentration was 0.05 mg/m(3) (the volume of the air sample was 75 L) . The relative standard deviation was 1.94%~3.55%, and the average recovery of standard addition was 95.0%~96.0%.

CONCLUSION

The method of AFS after alkali fusion for determination of tin dioxide in workplace air is proved to be simple, rapid, sensitive, and accurate, with complete digestion.