部分城市空气中颗粒物的元素组成比较

通过对数浓度图和分歧系数对中国广义、武汉、兰州和重庆4座城市空气中粗细颗粒物的42种元素组成进行了比较。结果表明，与人类活动有关的污染元素主要富集在细颗粒物中，而粗颗粒物中元素相对于细颗粒物来说更多的来自于土壤；同一座城市内城区同郊区相比，元素污染更严重，城郊之间细颗粒物中元素在短距离和有利地形下传输作用十分明显。同时还比较了城市之间的元素污染程度。结果表明，兰州城区相对于其它采校点位颗粒物中元素污染较为

Comparison of Elements in Particulate Matters in Air of Partial Cities in China

Elements component in particulate matter is a com-mon interest in the field of environmental study. By using concentration diagram and coefficient of diver-gence, elements component of fine or coarse particulate matters in air of the 4 Chinese cities has been compared. The results showed that pollution elements re-lating to human activities were principally enriched in fine particulate, while those in coarse particulate, prin-cipally come from soil compared with fine particulate. Elements pollution in urban area was more severe than that in suburban area. Transportation of elements in fine particulates from urban to suburban was very significant under the condition of short-distance and advantage landform. Meanwhile, elements pollution de-gree among cities was also being compared. Lanzhou urban site was the most polluted site among the eight compared sites of the 4 Chinese cities.