海峡西岸典型城市大气降尘稀土元素生态风险及来源--基于钕同位素MixSIAR模型解析  

The ecological risks and sources of rare earth elements in the dustfall in typical cities of West China Strait—Based on neodymium isotope tracing combined with MixSIAR model.

作　　者：李依鸿 于瑞莲[1] 张瑞琦 胡恭任[1] 颜妍 LI Yi-hong;YU Rui-lian;ZHANG Rui-qi;HU Gong-ren;YAN Yan(Department of Environmental Science and Engineering,Huaqiao University,Xiamen 361021,China;Center of Analysis,Beijing Research Institute of Uranium Geology,Beijing 100029,China)

机构地区：[1]华侨大学环境科学与工程系,福建厦门361021 [2]核工业北京地质研究院分析测试研究中心,北京100029

出　　处：《中国环境科学》2023年第11期5663-5670,共8页China Environmental Science

基　　金：国家自然科学基金资助项目(42377244);福建省自然科学基金资助项目(2022J01313);海洋大气化学与全球变化重点实验室开放基金(GCMAC2009)。

摘　　要：为了探明海峡西岸典型城市大气降尘中稀土元素生态风险及其来源贡献,在泉州市不同功能区设置了15个采样点位,对大气降尘样品和主要潜在污染源样品进行采集和分析.采用潜在生态风险指数对稀土元素的风险进行评价,采用Nd同位素MixSIAR模型进行定性分析和定量计算.结果表明,海峡西岸典型城市降尘稀土元素的潜在生态风险指数整体处于低风险等级,Lu元素在部分点位处于中风险,工业区、商业区及交通繁忙区个别采样点潜在风险指数相对较高.εNd(0)vs Eu/Eu*和εNd(0)vsΣREEs关系图解显示,大气降尘样品中稀土元素受自然源以及汽车尾气尘、燃煤热电厂飞灰、水泥厂飞灰等局地人为排放的影响较大.利用Nd同位素(^(143)Nd/^(144)Nd)MixSIAR模型计算出各潜在源的相对贡献率,泉州市大气降尘中稀土元素受土壤母质层(24.0%~40.9%)影响较大,其次是汽车尾气尘(20.7%~33.3%)和燃煤尘(21.1%~29.0%),受水泥厂飞灰(13.7%~20.0%)影响相对较小.Rare earth elements as a kind of emerging contaminants(ECs)began to be widely concerned by scholars.In order to investigate the ecological risk and source contribution of rare earth elements in atmospheric dust in typical cities on the west coast of the China Straits,15 sampling sites were set up in different functional areas of Quanzhou City to collect and analyze atmospheric dust samples and main potential pollution sources.The potential ecological risk index was used to evaluate the risk of rare earth elements,and the Nd isotope MixSIAR model was used for qualitative analysis and quantitative calculation.On the whole,the potential ecological risk index of rare earth elements in the dustfall in typical cities on the west coast of the Taiwan Strait was at low risk level.While Lu element was at medium risk at some sampling points,and the potential risk index of individual sampling points in industrial areas,commercial areas and heavy traffic areas was relatively high.The Plot ofεNd(0)vs Eu/Eu*andεNd(0)vsΣREEs show that rare earth elements in atmospheric dust samples were greatly affected by natural sources and local anthropogenic emissions such as gasoline exhaust dust,coal burning dust and cement dust.The relative contribution rate of each potential source was calculated by using the(^(143)Nd/^(144)Nd)MixSIAR model.The influence of rare earth elements in atmospheric dusfall in Quanzhou City was greatly influenced by the background soil(24.0%~40.9%),followed by gasoline exhaust dust(20.7%~33.3%)and coal burning dust(21.1%~29.0%).The impact of cement dust(13.7%~20.0%)was relatively low.

关 键 词：大气降尘 稀土元素 生态风险 Nd同位素示踪 MixSIAR模型 

分 类 号：X513[环境科学与工程—环境工程] X142