| A serial sampling work of PM2.5 and PM10 were made from Aug to Dec, 2006 in Tianjin. Concentration and monthly changes of 17 elements such as Na, Al etc were obtained. It showed that average element concentration of PM2.5 was 17.2 μg/m3 (10.3%). Trace elements such as Zn, Pb were high concentration both in PM10 and PM2.5, while Cr, V, Ni and As were existed mainly in PM2.5. Enrichment factor analysis indicated that enrichment of all elements were higher in PM2.5 than that of PM10. All crustal elements except Ca were detected as non enrichment, whereas the trace elements all showed a character of enrichment. Cd was obviously enriched in Tianjin particulate matters. The factor analysis also showed that soil dust, coal burning, engine exhaust and chemical industry were the major sources for inorganic elements of PM2.5. |
