Development of an X-ray fluorescence spectrometric method for the analysis of atmospheric aerosol samples

A simple, rapid method was developed for the analysis of aerosol samples by X-ray fluorescence spectrometry. Aerosol measurements were made using various sample supports (Whatman and Teflon filters, Prolene® foil). The calibration procedure was carried out by dripping 500 μl of a gradually diluted multi-elemental standard solution (CertiPUR® 11355) onto the top of the sample supports, which were then dried at ambient temperature. Thirteen elements, namely Na, Al, K, Ca, Cr, Mn, Fe, Co, Ni, Cu, Zn, Sr and Pb were calibrated and quantified. The optimal measurement parameters (excitation conditions, measuring times for each element) were determined on the basis of blank values and the amplitude of the signals. The filters were covered with Ta or Re plates to ensure infinite thickness for the penetration depth of the primary X-ray beam. It was also demonstrated that these plates served as a secondary target. The accuracy, precision and detection limits (0.01-0.18 mg/kg) were calculated. All the analytical parameters were better when Teflon filters and Prolene® foil were used than in the case of Whatman quartz fibre filters.