Anthropogene Staeube in der Aussenluft in Baden-Wuerttemberg: Physikalisch-chemische Analyse und toxikologische Bewertung. T. 2 Ausgewaehlte anorganisch-chemische Komponenten in Luftstaeuben Baden-Wuerttembergs

Since November 1987 aerosol samples were collected at seven sampling sites in Baden-Wuerttemberg (FRG) and analysed for the inorganic components H"+, NH_4"+, Na"+, K"+, Ca"2"+, Mg"2"+, Cl"-, NO_3"-, SO_4"2"-, Pb, Cd and Ni. For most of the investigated components the results indicate a distinct concentration gradient from urban to remote areas. The anthropogenic heavy metals Pb, Cd and Ni are especially concentrated in the dust. As compared to results obtained from earlier investigation the concentrations in general decreased during the past years. During inversions however the concentrations of nearly all compnents considerably increased. Ion balances confirm that ammonium sulphate is the main component in the aerosols. Ammonia ions predominate with amounts of about 70% in the cationic fraction; in the anionic fraction sulphate ions prevail representing about 90% of the anionic components. Local characteristics have an influence on the ion balances. Analyses by PIXE of selected aerosol samples show relatively high concentrations of further heavy metals in urban areas, for elements of natural origin however no considerable regional differences were observed. (orig.)SIGLEAvailable from TIB Hannover: F95B750 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekLand Baden-Wuerttemberg, Stuttgart (Germany); Commission of the European Communities (CEC), Brussels (Belgium)DEGerman