Effects of soil metal(loid)s pollution on microbial activities and environmental risks in an abandoned chemical smelting site  

作　　者：Hao Li Jun Yao Jianli Liu Ning Min Geoffrey Sunahara Dongyang Men Robert Duran 

机构地区：[1]School of Water Resources and Environment,Research Center of Environmental Science and Engineering,China University of Geosciences(Beijing),Beijing 100083,China [2]Department of Natural Resource Sciences,McGill University,21111,Lakeshore Drive,Ste-Anne-de-Bellevue,Quebec,H9X 3V9,Canada [3]Equipe Environnement et Microbiologie,MELODY group,Universitéde Pau et des Pays de l’Adour,E2S-UPPA,IPREM UMR CNRS 5254,BP 1155,64013 Pau Cedex,France

出　　处：《Journal of Environmental Sciences》2024年第9期60-70,共11页环境科学学报（英文版）

基　　金：supported by the National Key Research and Development Program of China(No.2019YFC1803500);the National Natural Science Foundation of China(No.42230716);the National Natural Science Foundation of China(No.42007289);the 111 Project(No.B21017);the Centre National de la Recherche Scientifique(No.CNRS PRC1416,France);the 1000-Talents Plan project(No.WQ2017110423)。

摘　　要：Abandoned chemical smelting sites containing toxic substances can seriously threaten and pose a risk to the surrounding ecological environment.Soil samples were collected from different depths(0 to 13 m)and analyzed for metal(loid)s content and fractionation,as well as microbial activities.The potential ecological risk indices for the different soil depths(ordered from high to low)were:1 m(D-1)>surface(S-0)>5 m(D-5)>13 m(D-13)>9 m(D-9),ranging between 1840.65-13,089.62,and representing extremely high environmental risks,of which Cd(and probably not arsenic)contributed to the highest environmental risk.A modified combined pollution risk index(MCR)combining total content and mobile proportion of metal(loid)s,and relative toxicities,was used to evaluate the degree of contamination and potential environmental risks.For the near-surface samples(S-0 and D-1 layers),the MCR considered that As,Cd,Pb,Sb,and Zn achieved high and alarming degrees of contamination,whereas Fe,Mn,and Ti were negligible or low to moderate pollution degrees.Combined microcalorimetry and enzymatic activity measurements of contaminated soil samples were used to assess the microbial metabolic activity characteristics.Correlation analysis elucidated the relationship between metal(loid)s exchangeable fraction or content and microbial activity characteristics(p<0.05).The microbial metabolic activity in the D-1 layer was low presumably due to heavy metal stress.Enzyme activity indicators and microcalorimetric growth rate(k)measurements were considered sensitive indicators to reflect the soil microbial activities in abandoned chemical smelting sites.

关 键 词：Abandoned chemical smelting sites Microbial activities Modified combined pollution risk MICROCALORIMETRY Enzymatic activities 

分 类 号：X53[环境科学与工程—环境工程] X172