1,721,107 research outputs found
Optimization of an urban particulate matter multi-element analysis method by inductively coupled plasma - Atomic emission spectrometry (ICP-AES)
No full textIn the present work a method for simultaneous metals determination, in urban air particulate matter by ICP-AES has been set up. A large number of elements (18) has been analyzed, including major (Al, Fe, K, and Mg), minor (Na, Ph and Zn) and trace (As, Cd, Co, Cr, Cu, Hg, Mn, Ni, Sb, Sr and V) elements. The procedure, consists of microwave sample acidic total digestion by HNO3/HF mixture and subsequent analysis by ICP-AES, using different assemblies depending on sample treatment procedure: a quartz Meinhard nebulizer/cyclonic chamber, if HF excess was eliminated, or a cross-flow nebulizer/plastic Scott chamber, suitable for application with HF. A cyclonic chamber for hydride generation was used for As, Sb and Hg determination. The procedure was tested with Standard Reference Materials 1648 NIST Urban Particulate Matter and Certified Reference Material No8 NIES "Vehicle Exhaust Particulates". Two sampling supports, quartz fibre and polycarbonate filters, have been examined in order to find the most suitable i.e. the one characterized by less interference. Some real samples of urban air particulate matter, TSP, PM10 and PM2.5 fractions, collected during an intercomparison campaign promoted by Regione Lombardia, have been analyzed with the procedure developed
A key factor in modern protection of historic buildings: the assessment of penetratoion of water repellent polymers into porous stone materials
No full textINFRARED SPECULAR REFLECTION SPECTRA OF COPPER-ZINC PHOSPHATE-GLASSES
No full textCopper-zinc phosphate glasses of composition xZnO-yCuO-zP2O5, with (x + y)/z varying between 1 and 2, have been synthesized and examined in the 2000-400 cm-1 range by infrared specular reflection spectroscopy. This technique has proved to be a useful tool to characterize the short-range structure of the phosphate matrix in these glasses
Caratterizzazione delle pitture murali della necropoli di Sos Furrighesos (Anela, Italia)
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