薄雾
微粒
环境化学
环境科学
大气(单位)
生物利用度
特大城市
亚洲尘埃
气溶胶
大气科学
化学
气象学
地理
地质学
经济
经济
有机化学
生物
生物信息学
作者
Huiming Li,Qin’geng Wang,Min Shao,Jinhua Wang,Cheng Wang,Yanxin Sun,Xin Qian,Huadong Wu,Meng Yang,Fengying Li
标识
DOI:10.1016/j.envpol.2015.10.042
摘要
Haze caused by high particulate matter loadings is an important environmental issue. PM2.5 was collected in Nanjing, China, during a severe haze-fog event and clear periods. The particulate-bound elements were chemically fractionated using sequential extractions. The average PM2.5 concentration was 3.4 times higher during haze-fog (96-518 μg/m(3)) than non-haze fog periods (49-142 μg/m(3)). Nearly all elements showed significantly higher concentrations during haze-fog than non-haze fog periods. Zn, As, Pb, Cd, Mo and Cu were considered to have higher bioavailability and enrichment degree in the atmosphere. Highly bioavailable fractions of elements were associated with high temperatures. The integrated carcinogenic risk for two possible scenarios to individuals exposed to metals was higher than the accepted criterion of 10(-6), whereas noncarcinogenic risk was lower than the safe level of 1. Residents of a city burdened with haze will incur health risks caused by exposure to airborne metals.
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