A review of research advances in the distributions and risk assessments of metal elements in atmospheric particles with different particle sizes
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摘要:
金属元素(MEs)是大气颗粒物的重要组成部分。综述了不同粒径大气颗粒物中MEs的分布、生态风险和人体健康风险评估的研究现状。在颗粒物中MEs主要呈现3种粒径分布:细模态单峰型、粗模态单峰型和双峰型,对应于不同的污染源。富集因子法、地累积指数法和潜在生态风险指数法是MEs生态风险评价最常用的3种方法,大部分MEs在细模态的富集程度远高于粗模态,我国城市大气颗粒物均呈现非常高的综合潜在生态风险(风险指数>1 000)。Cd、Pb、As是目前主要的污染元素,应重点关注。不同粒径段的颗粒物会沉积在呼吸系统不同部位。健康风险评估结果显示,我国大部分城市地区均存在重金属元素对人体的致癌风险和非致癌风险,会对人体产生致癌风险的MEs有Cr、As和Cd,Mn可能引起非致癌风险。因此,将不同粒径段颗粒物中MEs的分布特征和风险评估结合起来是未来该领域的重点研究方向。
Abstract:Metal elements (MEs) are important compositions of atmospheric particles. The research progress of distributions and ecological and human health risk assessments of MEs in atmospheric particles with different particle sizes were reviewed. In atmospheric particles, MEs mainly presented three particle size distributions: unimodal distribution with the peak in fine or coarse mode particles, and bimodal distribution, corresponding to different pollution sources. Moreover, enrichment factor, geo-accumulation index and potential ecological risk index were the common three methods for ecological risk assessment of MEs. The degrees of enrichment of fine mode particles were significantly higher than that of coarse mode particles for most MEs. Atmospheric particles in Chinese cities all showed a very high comprehensive potential ecological risks (Risk Index > 1 000). Cd, Pb, As were the main polluting elements at present, which should be paid special attention to. In addition, particles of different sizes would be deposited in different parts of the respiratory system. The health risk assessments showed that heavy metals had carcinogenic and non-carcinogenic risks to the human body in most Chinese cities. Cr, As and Cd showed carcinogenic risks to human health, and Mn may cause non-cancer risks. Thus, combining the distribution characteristics of MEs in particles with different particle sizes with their risk assessment was the key research direction in this field in the future.
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图 1 中国不同城市大气颗粒物中MEs潜在生态风险等级
注:数据来源同表1。
Figure 1. Potential ecological risk grade of MEs in atmospheric particles of different Chinese cities
表 1 中国不同城市大气颗粒物中MEs污染程度
Table 1. MEs pollution levels of atmospheric particles in different cities in China
城市 采样时间 颗粒物 污染元素 污染等级 数据来源 北京 2016年3月—2017年1月 PM2.5 Cu、Zn、As、Cd、Pb、Ag、Mo 中度及以上 文献[26,38] 天津 2011年11—12月 PM2.5 Cu、Zn、Hg、Cd、Pb 中度及以上 文献[39] 邯郸 2017年1月 PM2.5 Cu、As、Cd 重度到极重度 文献[40] 太原 2012年2月 PM2.5 Cu、Zn、Hg、Cd、Pb、Ni 中度及以上 文献[41] 济南 2016年10月—2017年10月 PM2.5 Cu、Zn、Cd、Pb 重度及以上 文献[42] 合肥 2016年5—6月 扬尘 Cu、Zn、Sb、Ga、As、Pb 偏重度到极重度 文献[43] 黄石 2015年1—12月 PM2.5和
PM10Cu、Cd、As、Pb 重度及以上 文献[44] 株洲 2011年12月—2012年1月、2012年8月 PM2.5和
PM10Zn、Cu、Cd、Pb 重度及以上 文献[45] 广州 2016年 PM2.5 Cd、As、Sb 偏重度 文献[46] 东莞 Cd、As、Sb 中度到重度 佛山 Pb、Cd、As、Sb 偏重度到重度 珠海 Cd 偏重度 肇庆 Cd、Sb 偏重度 惠州 Cd 中度 表 2 健康风险评估模型参数及取值
Table 2. Parameters and values of health risk assessment models
项目 参数 定义 单位 数值 成人 儿童 暴露参数 EF 暴露频率 d/a 350 350 ED 暴露年限 a 24 6 AT 平均暴露时间 d 365×ED(非致癌作用)、
365×70(致癌作用)365×ED(非致癌作用)、
365×70(致癌作用)BW 平均体重 kg 60 15 CF 单位转换系数 kg/mg 10−6 10−6 手-口摄入 IngR 摄入降尘速率 mg/d 100 200 呼吸吸入 InhR 呼吸速率 m3/d 15.2 PEF 颗粒物排放因子 m3/kg 1.36×109 1.36×109 皮肤接触 SA 皮肤暴露面积 cm2 5700 2800 SL 皮肤黏着度 mg/(cm2·d) 0.2 0.2 ABS 皮肤吸收因子 0.001 0.001 -
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