Cd/Pb behavior during combustion in a coal-fired power plant and their spatiotemporal impacts on soils:New insights from Cd/Pb isotopes  

作　　者：Yafei Xia Ting Gao Yuhui Liu Meng Qi Jian-Ming Zhu Hui Tong Yiwen Lv Chengshuai Liu 

机构地区：[1]State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China [2]National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China,Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management,Guangdong Institute of Eco-environmental Science&Technology,Guangdong Academy of Sciences,Guangzhou 510650,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Beijing 100083,China

出　　处：《Journal of Environmental Sciences》2025年第4期582-593,共12页环境科学学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(No.42025705);the Construction Project of Modern Agricultural Science and Technology Innovation Alliance of Guangdong Province,China(No.2023KJ112);the National Natural Science Foundation of China(Nos.41977291 and 42177242);the GDAS’Project of Science and Technology Development,China(No.2019GDASYL-0103048).

摘　　要：Coal power plants annually generate quantities of byproducts that release environmentally hazardous heavy metals like Cd and Pb.Understanding the behavior and spatiotemporal impacts on soils of these releases is crucial for pollution control.This study investigated the concentrations and isotope ratios of Cd/Pb in combustion byproducts,depositions and soils collected froma coal-fired power plant or its surrounding area.The pulverized fuel ash(PFA)and desulfurized gypsum(DG)exhibited heavier Cd isotopes withΔ^(114)Cd values of 0.304‰and 0.269‰,respectively,while bottom ash(BA)showed lighter Cd isotopes(Δ^(114)CdBA-coal=–0.078‰),compared to feed coal.We proposed a two-stage condensation process that governs the distribution of Cd/Pb,including accumulation on PFA and DG within electrostatic precipitators and desulfurization unit,as well as condensation onto fine particles upon release from the stack.Emissions from combustion and large-scale transport make a significant contribution to deposition,while the dispersion of Cd/Pb in deposition is primarily influenced by the prevailing wind patterns.However,the distribution of Cd/Pb in soils not only exhibit predominant wind control but is also potentially influenced by the resuspension of long-term storage byproducts.The power plant significantly contributes to soil in the NW–N–NE directions,even at a considerable distance(66%–79%),demonstrating its pervasive impact on remote regions along these orientations.Additionally,based on the vertical behavior in the profile,we have identified that Cd tends to migrate downward through leaching,while variations in Pb respond to the historical progression of dust removal.

关 键 词：Heavy metal diffusion Coal combustion Source tracing Atmospheric deposition Isotope fractionation Soil pollution 

分 类 号：X131[环境科学与工程—环境科学]