Levels, sources, isotope signatures, and health risks of mercury in street dust across China
Levels, sources, isotope signatures, and health risks of mercury in street dust across China
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中国街道灰尘中汞的含量、来源、同位素特征和健康风险
DOI：
10.1016/j.jhazmat.2020.122276
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发表时间：
2020
影响因子：
13.6
通讯作者：
Wu Yunjie
中科院分区：
文献类型：
--
作者：
Sun Guangyi;Feng Xinbin;Yang Chenmeng;Zhang Leiming;Yin Runsheng;Li Zhonggen;Bi Xiangyang;Wu Yunjie
收集了中国14个城市的街道灰尘样品，并对46个城市的数据进行了回顾，研究了中国街道灰尘中汞的空间分布和同位素特征。还评估了街道灰尘的潜在来源和对人类的相关健康风险。60个城市街道灰尘中总汞浓度范围为0.020-39.1 mg kg− 1，平均值为0.433 ± 0.185 mg kg− 1。来自14个城市的街尘样品的δ 202 Hg（−0.61 ± 0.92‰）和Δ 199 Hg（−0.03 ± 0.08‰）值均为负值，煤燃烧和工业活动是街尘中Hg的主要来源。估计的成年人和儿童街头灰尘暴露的THg的平均可能每日摄入量（PDI）（分别为1.36E-03和1.27E-02 μg d− 1 kg −1）与他们各自通过食用大米的暴露量相当。儿童暴露于灰尘中的THg是汞矿区的一个主要问题（例如，在以煤炭为基础的工业和有色金属冶炼为主的城市，也可能受到关注。这项研究的结果表明，暴露于街道灰尘是不是在中国的主要甲基汞暴露途径。
Spatial distribution and isotope signature of mercury (Hg) in street dusts across China were investigated by collecting dust samples from 14 cities and reviewing previously published data from an additional 46 cities. Potential sources of street dust and the associated health risks to humans were also assessed. The total Hg (THg) concentrations in street dust ranged from 0.020–39.1 mg kg−1with an average of 0.433 ± 0.185 mg kg−1in the 60 cities. Street dust samples collected from 14 cities were characterized by slightly negative δ202Hg (−0.61 ± 0.92‰) and near-zero Δ199Hg (−0.03 ± 0.08‰) values, and coal combustion and industrial activities were estimated to be the major sources of Hg in street dust. The estimated average probable daily intake (PDI) of THg from street dust exposure for adults and children (1.36E–03 and 1.27E–02 μg d−1kg−1, respectively) were comparable to their respective exposures via rice consumption in China. Children being exposed to THg in dust is a major concern in mercury mining areas (e.g., Wangshan and Xunyang), and may also be a concern in cities with major coal-based industries and nonferrous metal smelting. Results from this study suggest that exposure to street dust is not a primary MeHg exposure pathway in China.