中文摘要：

采用综合评分法对兰州市大气颗粒物中化学特征污染物进行筛选．综合评分法的指标体系主要由环境检出率、潜在危害指数和环境影响度等9项指标组成，综合分值总分为280分．筛选结果表明：苯并[a]芘（综合评分为272，下同）、Pb（262）、cr（262）、Ni（262）、cd（262）、cu（246）、苯并[a]蒽（230）、二苯并[a，h]蒽（215）、Zn（214）、苯并fb]荧蒽（212）10种化学污染物得分较高，为兰州市大气颗粒物中重点关注的化学污染物．而Hasse图解法筛选结果表明，苯并[al芘、Ph、cr、二苯并[a，h]蒽、Ni、Cd、cu、zn、苯并[a]蒽9利t化学污染物的危害性排序靠前．在综合评分法的基础上利用Hasse图解法对化学特征污染物进行筛选，按照危害性大小，兰州市大气颗粒物中化学特征污染物可分为5个层次，依次为：①苯并[a]芘、Pb和Cr；②Ni、二苯并[a，h]蒽；③Cu、Cd；④苯并[a]蒽、Zn；⑤苯并[b]荧蒽．综合评分法和Hasse图解法的结合应用既筒化了单一Hasse图解法筛选化学特征污染物的繁琐过程，又可实现对污染物危害性的较全面认识．

英文摘要：

To investigate chemical characteristic pollutants bound to the particulate matter, Lanzhou City was selected as the target city to monitor and analyze the concentration of 22 major chemical pollutants such as Benzo[a] pyrene, Pb, Cr and Ni. In order to screen chemical characteristic pollutants, a combination of comprehensive evaluation and Hasse diagram method was applied to screen characteristic pollutants from atmospheric particulate matter in Lanzhou City according to the atmospheric pollution characteristics （history） and situation. At first, comprehensive evaluation has been used to screen characteristic pollutants of 22 chemical pollutants in the particulate matter. The index system was composed of 9 indices including environmental detection rate, potential damage index and environmental health influence degree, and the total score was 280. The results showed that Benzol a] pyrene （the total score was 272,below）, Pb （262）, Cr （262）, Ni （262）, Cd （262）, Cu （246）, Benzo[ a ] anthraeene （230）, Dibcnzo [ a, h ] anthracene （ 215 ） , Zn （214） , Benzene[ b] fluoranthene （212） had a greater score and need to be pay much attention to. Similarly, the 22 pollutants were screened by Hasse diagrams, the results showed that Benzo [a]pyrene, Pb, Cr, Oihenzo [a,h] anthracene, Ni, Cd, Cu,Zn, Benzo[ a ] anthracene were in the front of Hasse diagram. On the base of comprehensive evaluation method, the Hasse diagram method was adopted to screen chemical characteristic pollutants. The results revealed that selected chemical pollutants could be divided into 5 levels by their hazards （ ranked in descending order） ： （ 1 ） Benzol a] pyrene, Pb and Cr, （2） Ni, Dibenzo[ a,h ] anthracene, （3） Cu, Cd, （4） Benzol a] anthracene, Zn, （5） Benzol b] fluoranthene. In conclusion, the combination of two methods has not only simplified the Hasse diagram method, but also achieved a more accurate hazard ranking for the characteristic pollutants, which has rationalized pollutant