Distribution and bioavailability of mercury in size-fractioned atmospheric particles around an ultra-low emission power plant in Southwest China

作     者：Wei Zhang Jinjuan Li Hao Qiu Xingqiang Guo Zhijun Fei Yi Xing Deliang Yin Wei Zhang;Jinjuan Li;Hao Qiu;Xingqiang Guo;Zhijun Fei;Yi Xing;Deliang Yin

作者机构：College of Resources and Environmental EngineeringGuizhou UniversityGuiyang 550025China College of Resources and Environmental EngineeringGuizhou Institute of TechnologyGuiyang 550003China Key Laboratory of Karst Georesources and Environment(Guizhou University)Ministry of EducationGuiyang 550025China School of Energy and Environmental EngineeringUniversity of Science&Technology BeijingBeijing 100083China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2024年第138卷第4期

页      面：141-152页

核心收录：

学科分类：0710[理学-生物学] 083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 0703[理学-化学] 

基　　金：supported by the Science and Technology Project of Guizhou Province(No.QKHJC1Y187) the National Natural Science Foundation of China(Nos.41265008,42007305,and 22166009)。 

主　　题：Size-fractioned particles Mercury Chemical speciation Coal-fired power plant Ultra-low emission 

摘      要：Ultra-low emission(ULE)technology retrofits significantly impact the particulate-bound mercury(Hg)emissions from coal-fired power plants(CFPPs);however,the distribution and bioavailability of Hg in size-fractioned particulate matter(PM)around the ULE-retrofitted CF-PPs are less understood.Here,total Hg and its chemical speciation in TSP(total suspended particles),PM_(10)(aerodynamic particle diameter≤10μm)and PM_(2.5)(aerodynamic particle diameter≤2.5μm)around a ULE-retrofitted CFPP in Guizhou Province were quantified.Atmospheric PM_(2.5)concentration was higher around this ULE-retrofitted CFPP than that in the intra-regional urban cities,and it had higher mass Hg concentration than other sizefractioned PM.Total Hg concentrations in PM had multifarious sources including CFPP,vehicle exhaust and biomass combustion,while they were significantly higher in autumn and winter than those in other seasons(P40%).Mass concentrations of exchangeable,HCl-soluble,elemental,and residual Hg in PM_(2.5)were higher than those in other size-fractioned PM,and were markedly elevated in autumn and winter(P0.05).In PM_(2.5),HCl-soluble Hg presented a significantly positive relationship with elemental Hg(P0.05),while residual Hg showed the significantly positive relationships with HCl-soluble Hg and elemental Hg(P0.01).Overall,these results suggested that atmospheric PM-bound Hg around the ULE-retrofitted CFPP tends to accumulate in finer PM,and has higher bioavailable fractions,while has potential transformation between chemical speciation.