摘要
目的了解兰州市城关区大气细颗粒物(PM_(2.5))中多环芳烃(PAHs)的季节污染特征,并对其健康风险进行评价。方法选择兰州市城关区作为采样点,于2015年1月—2015年12月期间周期性采集大气PM_(2.5)样品84份,利用高效液相色谱仪分析其中PAHs的含量。结果 2015年总PHAs浓度变化范围为(3.64～268.23) ng/m^3,季节变化规律为冬季>秋季>春季>夏季。在不同季节,3-5环PAHs占总PAHs的比例最大。通过健康风险评估发现,成人通过呼吸道途径暴露造成的终生致癌超额危险额度均已超过人群可接受最大风险水平,儿童终生致癌超额危险度处于可接受水平。结论兰州市城关区大气PM_(2.5)中PAHs污染水平较高,人们长期暴露在此环境中,存在一定致癌风险。
Objectives To investigate the seasonal pollution characteristics and carry out a health risk assessment of polycyclic aromatic hydrocarbons(PAHs) in ambient PM2.5 in Chengguan district of Lanzhou. Methods Chengguan district of Lanzhou was selected as the sampling site. A total of 84 ambient air samples were collected periodically from January to December 2015, and the concentrations of PAHs in PM2.5 were determined by High Performance Liquid Chromatography(HPLC). Results The concentrations of total PAHs ranged from 3.64 to 268.23 ng/m^3 in 2015 and followed the descending order: winter > autumn > spring > summer. In different seasons, the three to five rings PAHs occupied the largest proportion in total PAHs. Through health risk assessment of PAHs, it was found that excess lifetime cancer risks of PAHs from breathing exposure for adults have all exceeded the maximum acceptable risk level, but the excess lifetime cancer risk of children were at an acceptable level. Conclusions The pollution of PAHs in ambient air of Lanzhou was serious that may cause carcinogenic risk to some extent to people who are exposed to this environment for a long time.
作者
原晓蓉
赵红
王宇红
牛静萍
李盛
余加琳
贾清
YUAN Xiaorong;ZHAO Hong;WANG Yuhong;NIU Jingping;LI Sheng;YU Jialin;JIA Qing
出处
《环境卫生学杂志》
2019年第2期128-133,共6页
JOURNAL OF ENVIRONMENTAL HYGIENE
基金
兰州市人才创新项目(2015-RC-59)
