A Glance of Air Pollution of Beijing City by Using Poplar Leaves and Naa Techniques
A GLANCE OF AIR POLLUTION OF BEIJING CITY BY USING POPLAR LEAVES AND NAA TECHNIQUES NIBANGFA, TIAN WEEK, WANGPINGSHENG, ZHANG YANGMEI, CHAO LEI, HE GAOKUI China Institute of Atomic Energy, P.O. Box 275-50, Beijing, 102413, China XAO102858 Abstract: Forty six Chinese White Poplar (CWP) leave samples were taken from different districts of Beijing proper and outskirt. 32 trace elements, As, Au, Ba, Br, Ca, Cd, Ce, Co, Cr, Cs, Eu, Fe, Iff Hg, K, La, Lu, Mo, Na, Rb, Sb, Sc, Se, Sm, Sr, Ta, Tb, Th, U, W, Yb and Zn have been determined by using relative and KQ method of instrumental neutron activation analysis (NAA) techniques. Each element was normalized by the average. Values of two times of average are considered as notable or suspected pollution. Three times of average are considered as very notable or polluted. In this case, the results indicated: 1) Clues of prominent suspected element pollution: Br is prominent in the area of heavy traffic, sites 4, 13, 27 and 38; Four sites (6, 7, 8, 9) at south of downtown are indicated the very notable level for Ni and Sb; Ca is relatively higher in the constructing area, sites 27 and 29; Sites 34 to 36 and sites 43 to 45 indicate the high concentration ofRb, both group sites are located at west of Beijing; At northwest, sites 25 to 28 show the notable level of Co. 2) Very notable pollution sites: In site 6, close to a railway station, concentration of 12 elements are more than two times higher than the average, especially Hf, Ni and Sb; In site 26, a high technical special zone, the concentrations of rare earth elements (REE) are more than 4 times of the average, Hfand Ta are extraordinary high.
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