Characteristics, secondary transformation, and health risk assessment of ambient volatile organic compounds (VOCs) in urban Beijing, China
Characteristics, secondary transformation, and health risk assessment of ambient volatile organic compounds (VOCs) in urban Beijing, China
复制标题
北京城区环境挥发性有机化合物（VOCs）特征、次生转化及健康风险评价
DOI：
10.1016/j.apr.2021.01.013
复制
发表时间：
2021-02-02
影响因子：
4.5
通讯作者：
Zha, Shuping
中科院分区：
文献类型：
--
作者：
Liu, Yafei;Kong, Liuwei;Zha, Shuping
对2016年北京市城区环境挥发性有机物（VOCs）进行了长期、高时间分辨率的连续监测。收集历史VOC数据并与我们的结果进行比较。采用正矩阵分解（PMF）模型确定潜在的排放源。利用不同区域气团中挥发性有机化合物的反向轨迹和浓度、臭氧形成势（OFP）和二次有机气溶胶势（SOAP）来估计挥发性有机化合物的化学行为和运输方向贡献。进行了健康评估，包括特定有害挥发性有机化合物种类的致癌风险和非致癌风险，同时采用点估计方法根据排放源进行风险分摊。本研究总观测VOCs （TVOCs）的平均（+/-标准差，Std）浓度为101.5 +/- 65.2 μ g/m(3)，范围为21.4 ~ 439.1 μ g/m(3)。根据汇编的VOC报告数据，北京的VOC浓度有所下降，但仍高于中国其他城市。燃烧源是北京城区VOC污染的主要来源。根据VOC浓度、OFP和SOAP数据，VOC的贡献越来越多地来自西北地区，而不仅仅来自北京以南地区。北京市居民应考虑VOCs的潜在健康风险。本研究结果可为北京市有效的VOC排放管理和公众健康保护提供基础数据。
The long-term and high temporal resolution measurement of ambient volatile organic compounds (VOCs) was continuously performed in urban Beijing in 2016. Historical VOC data were compiled and compared with our results. A positive matrix factorization (PMF) model was used to determine potential emission sources. The backward trajectories and the concentration, ozone formation potential (OFP), and secondary organic aerosol potential (SOAP) of VOCs in the air masses from different regions were used to estimate the VOC chemical behaviour and transport-direction contributions. A health assessment, including the carcinogenic risk and non carcinogenic risk of specific hazardous VOC species, was performed, while the point estimate approach was used for risk apportionment based on emission sources. In this study, the average (+/- standard deviation, Std) concentration of total observed VOCs (TVOCs) was 101.5 +/- 65.2 mu g/m(3), ranging from 21.4 to 439.1 mu g/m(3). The VOC concentration in Beijing had decreased but was still higher than that in other Chinese cities according to compiled reported VOC data. Combustion-related sources were the primary sources of VOC pollution in urban Beijing. VOC contributions were increasingly coming from the northwestern regions instead of solely from regions to the south of Beijing according to the VOC concentration, OFP, and SOAP data. A potential health risk from VOCs should be considered for residents living in Beijing. The results of this study are expected to provide basic data for efficient VOC emission management and public health protection in Beijing.