“…Concentrations of numerous elements were determined, including potentially toxic metals, such as Pb, Tl, Mn, and Cr. 182 FD-MS technique has been employed in the determination of alkali elements in environmental samples, including cesium in a natural aerosol sample of 1-3 jug. 183 Zinc, cadmium, and lead in environmental samples have been analyzed by a technique involving isotope dilution MS. 184 …”