基于同位素的长治市大气环境PM_(2.5)和扬尘中Nd来源解析  

Source apportionment of Nd in atmospheric PM_(2.5)and fugitive dust based on isotope in Changzhi

作　　者：陈浩 闫雨龙 胡冬梅 彭林 王成 CHEN Hao;YAN Yulong;HU Dongmei;PENG Lin;WANG Cheng(MOE Key Laboratory of Resources and Environmental System Optimization,College of Environmental Science and Engineering,North China Electric Power University,Beijing 102206;Engineering Research Center of Clean and Low-carbon Technology for Intelligent Transportation,Ministry of Education,School of Environment,Beijing Jiaotong University,Beijing 100044;Institute of Transport Energy and Environment,Beijing Jiaotong University,Beijing 100044;Department of Resource and Environmental Engineering,Shanxi Institute of Energy,Taiyuan 030600)

机构地区：[1]华北电力大学环境科学与工程学院,资源与环境系统优化教育部重点实验室,北京102206 [2]北京交通大学环境学院,智能交通清洁低碳技术教育部工程研究中心,北京100044 [3]北京交通大学交通能源与环境研究院,北京100044 [4]山西能源学院资源与环境工程系,太原030600

出　　处：《环境科学学报》2024年第5期361-367,共7页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.21976053,42103056);国家重点研发计划(No.2019YFC0214200)。

摘　　要：钕元素(Nd)是一种典型的镧系元素,对人体肺部有一定危害,厘清大气环境PM25和扬尘中Nd的来源对其管控有重要意义.本研究采集了长治市2017年秋季、冬季和2018年夏季大气环境PM_(2.5)、道路扬尘和城市扬尘及其他典型污染源样品,采用MC-ICPMS测试了样品中Nd同位素比值(^(143)Nd/^(144)Nd),并使用贝叶斯同位素混合模型分析了环境受体Nd的来源.结果表明,汽油车尾气、柴油车尾气、燃煤、土壤和钢铁生产中^(143)Nd/^(144)Nd具有明显差异性,燃煤和土壤中同位素值低于现有研究,表明其具有地域性特征.基于同位素特征的源解析结果显示,燃煤、汽油车尾气、钢铁生产、土壤和柴油车尾气对长治市大气PM_(2.5)中Nd平均贡献率分别为25.5%、24.7%、20.8%、16.4%和12.6%,冬季采暖增加导致燃煤对PM_(2.5)中Nd贡献最高(29.3%),夏季钢铁生产过程贡献最高(25.7%),秋季汽油车尾气排放贡献最高(28.8%).道路扬尘中Nd主要来自柴油车尾气(25.8%),而城市扬尘中Nd主要来自土壤(25.1%).燃煤、柴油车尾气、汽油车尾气、土壤、钢铁生产等排放源对大气环境颗粒物中Nd的影响呈现明显的季节变化特征,本研究精确解析了大气环境PM_(2.5)和扬尘中Nd的来源,可为Nd的控制提供参考.As a typical lanthanide element,Nd is harmful to the lungs of human body.Therefore,it is of great significant for Nd control to analyze the sources of PM_(2.5)in atmosphere and Nd in dust.In this study,the samples of PM_(2.5)in atmosphere,road fugitive dust and urban fugitive dust were collected during the autumn and winter of 2017,as well as in the summer of 2018 in Changzhi.And MC-ICPMS and employed Bayesian isotope mixing model(MixSIAR)were used to measure the Nd isotope ratio(^(143)Nd/^(144)Nd)and analyze the sources of PM_(2.5)-bound Nd,respectively.Results revealed that Nd isotopic composition in gasoline vehicle exhaust,diesel vehicle exhaust,coal combustion,soil and steel plants exhibited significant differences.The isotopic values in coal combustion and soil were much lower than other cities,which indicate a distinctive regional characteristic.The results of source apportionment based on isotope showed that the average contribution of coal combustion,gasoline vehicle exhaust,steel plants,soil,and diesel vehicle exhaust to PM_(2.5)-bound Nd in Changzhi urban area were 25.5%,24.7%,20.8%,16.4%,and 12.6%,respectively.The increasement of heating in winter lead to the highest contribution of Nd from coal combustion(29.3%)to PM_(2.5),while steel production processes had the highest contribution(25.7%)in summer,and gasoline vehicle exhaust emissions contribute most(28.8%)in autumn.The main source of Nd in road dust was diesel vehicle exhaust(25.8%),while urban dust primarily originated from soil(25.1%).The impact of emission sources such as coal combustion,diesel vehicle exhaust,gasoline vehicle exhaust,soil,and steel production on Nd in atmospheric showed obvious seasonal variation characteristics.This study accurately analyzed the sources of Nd in atmospheric PM_(2.5)and dust,supporting a foundation for Nd control.

关 键 词：PM_(2.5) ND同位素 扬尘 贝叶斯同位素混合模型 源解析 

分 类 号：X51[环境科学与工程—环境工程] X830.2