Different extractable pools of Cd and Pb in agricultural soil under amendments:Water-soluble concentration sensitively indicates metal availability  

作　　者：Zidi Wang Wenyao Tang Xiaodong Ding Qiang Dong Yingying Guo Guangliang Liu Yanwei Liu Yong Liang Yongguang Yin Yong Cai Guibin Jiang 

机构地区：[1]Institute of Environment and Health,Jianghan University,Wuhan 430056,China [2]Laboratory of Environmental Nanotechnology and Health Effect,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China [3]State Key Laboratory of Environmental Chemistry and Ecotoxicology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China [4]College of Resources and Environment,Qingdao Agricultural University,Qingdao 266109,China [5]BNU-HKUST Laboratory of Green Innovation,Advanced Institute of Natural Sciences,Beijing Normal University,Zhuhai 519087,China [6]University of Chinese Academy of Sciences(UCAS),Beijing 100049,China [7]Department of Chemistry and Biochemistry,Florida International University,Miami,FL 33199,USA [8]School of Environment,Hangzhou Institute for Advanced Study,UCAS,Hangzhou 310024,China

出　　处：《Journal of Environmental Sciences》2025年第4期297-308,共12页环境科学学报(英文版)

基　　金：supported by the National Natural Science Foundation of Shandong(No.ZR2020ZD20);the National Natural Science Foundation of China(No.22193051);the National Young Top-Notch Talents(No.W03070030);the Youth Innovation Promotion Association of the Chinese Academy of Sciences(No.Y202011).

摘　　要：Identification of the most appropriate chemically extractable pool for evaluating Cd and Pb availability remains elusive,hindering accurate assessment on environmental risks and effectiveness of remediation strategies.This study evaluated the feasibility of European Community Bureau of Reference(BCR)sequential extraction,Ca(NO_(3))_(2)extraction,and water extraction on assessing Cd and Pb availability in agricultural soil amended with slaked lime,magnesium hydroxide,corn stover biochar,and calcium dihydrogen phosphate.Moreover,the enriched isotope tracing technique(^(112)Cd and^(206)Pb)was employed to evaluate the aging process of newly introduced Cd and Pbwithin 56 days’incubation.Results demonstrated that extractable pools by BCR and Ca(NO_(3))_(2)extraction were little impacted by amendments and showed little correlation with soil pH.This is notable because soil pH is closely linked to metal availability,indicating these extraction methods may not adequately reflect metal availability.Conversely,water-soluble concentrations of Cd and Pb were markedly influenced by amendments and exhibited strong correlations with pH(Pearson’s r:-0.908 to-0.825,P<0.001),suggesting water extraction as a more sensitive approach.Furthermore,newly introduced metals underwent a more evident aging process as demonstrated by acid-soluble and water-soluble pools.Additionally,water-soluble concentrations of essential metals were impacted by soil amendments,raising caution on their potential effects on plant growth.These findings suggest water extraction as a promising and attractive method to evaluate Cd and Pb availability,which will help provide assessment guidance for environmental risks caused by heavy metals and develop efficient remediation strategies.

关 键 词：Heavy metals Water-soluble concentrations Enriched stable isotopes Soil amendments Sequential extraction Soil pH 

分 类 号：X53[环境科学与工程—环境工程]