Abstract：The aims of this study were to examine the concentrations of heavy metal in areas within the Beijing metropolitan subway network A total of 16 subway stations were selected. The contents of 7 trace heavy metals such as Pb, Cr, Cu, Zn, Ni, As and Hg were determined. Their pollution degree,health risk and source were analyzed by using the index of geoaccumulation, US EPA health risk assessment model and spearman correlation coefficient method. The results showed that the average contents of Cd (1.11 mg/kg), Cu (67.33mg/kg), Ni (41.77mg/kg), Hg (mg/kg), Pb (437.41mg/kg), Cr (131.92mg/kg), As (9.09mg/kg) in dust higher than the background values in Beijing more or less. The pollution assessment of heavy metal in subway dust showed that Pb (3.77), Hg (3.12), Cd (2.16) had a certain degree of pollution and their degrees of pollution manifested as Pb>Hg>Cd>Cr>Cu>Ni>As. The order of non-cancer hazard indexes of metals was Pb>Cr>As>Ni>Cu>Hg>Cd, The non-cancer hazard indexes were lower than their threshold values except for Pb. The carcinogen risks of metals of Cr, Cd, Ni and As were lower than their threshold values. Analysis indicated that the heavy meals accumulation of the subway dust were induced by anthropogenic input brakes and wheel–rail interface were the main pollution sources.
杨孝智, 陈扬, 徐殿斗, 贺婷婷, 马玲玲, 李杰, 聂长明. 北京地铁站灰尘中重金属污染特征及健康风险评价[J]. 中国环境科学, 2011, 31(6): 944-950.
YANG Xiao-Zhi, CHEN Yang, XU Dian-Dou, HE Ting-Ting, MA Ling-Ling, LI Jie, NIE Chang-Ming. Characteristics of heavy metal pollution and health risk assessment in subway dust in Beijing. CHINA ENVIRONMENTAL SCIENCECE, 2011, 31(6): 944-950.
