Comparative study of methods for the determination of airborne fluorides.

Some current methods for the determination of both particulate and gaseous compounds of fluorine, present in air as pollutants, are described and compared. The operation included sampling of the air, the separation of fluoride from interfering substances and its final determination. Results obtained for the separation of fluoride by distillation and by other techniques of microdiffusion are presented, as well as those obtained by the application of different methods to the subsequent determination of fluoride. The analytical method used by the authors is described, giving some results obtained in its application to the control of air pollution caused by an aluminium smelting