CHARACTERIZATION OF AEROSOL-ASSOCIATED LEAD BY DPASV AND LAMMA

Both a bulk-analytical and a micro-analytical technique were used to d etermine lead in standard particles and natural aerosols. The localiza tion of lead within standard particles was successfully studied. Both techniques were able to discriminate between particles which were coat ed with lead and particles with a homogeneous lead(II) distribution. T otal lead present in aerosols was successfully quantitatively determin ed with Differential Pulse Anodic Stripping Voltammetry (DPASV), X-Ray Fluorescence (XRF) and Graphite Furnace Atomic Absorption Spectrometr y (GFAAS). The results from the different techniques are in good agree ment. DPASV was also used to obtain information about the lability of lead associated with the aerosol particles. The observed potential shi fts indicate that lead forms labile complexes with the chemical groups of aerosol particles. With Laser Microprobe Mass Analysis (LAMMA), in formation on single particle composition was obtained. Most particles were mixed salts of ammonium nitrate and ammonium sulphate, with varia ble content of metals (especially V and Pb).