兰州市黄河风情线地表积尘及周边绿地土壤重金属污染特征及风险评价  

Pollution Characteristics and Risk Assessment of Heavy Metals in Surface Dusts and Surrounding Green Land Soils from Yellow River Custom Tourist Line in Lanzhou

作　　者：李军 李开明[1] 王晓槐[1] 焦亮 臧飞 毛潇萱 杨云钦 台喜生 LI Jun;LI Kai-ming;WANG Xiao-huai;JIAO Liang;ZANG Fei;MAO Xiao-xuan;YANG Yun-qin;TAI Xi-sheng(College of Urban Environment,Lanzhou City University,Lanzhou 730070,China;Key Laboratory of Resource Environment and Sustainable Development of Oasis Gansu Province,Northwest Normal University,Lanzhou 730070,China;College of Pastoral Agriculture Science and Technology,Lanzhou University,Lanzhou 730020 China;Key Laboratory forEnvironmental Pollution Prediction and Control,Gansu Province,College ofEarth and Environmental Sciences,Lanzhou University Lanzhou 730000,China)

机构地区：[1]兰州城市学院城市环境学院,兰州730070 [2]西北师范大学甘肃省绿洲资源环境与可持续发展重点实验室,兰州730070 [3]兰州大学草地农业科技学院,兰州730020 [4]兰州大学资源环境学院甘肃省环境污染预警与控制重点实验室,兰州730000

出　　处：《环境科学》2023年第6期3475-3487,共13页Environmental Science

基　　金：甘肃省科技计划项目(21JR1RA319);甘肃省绿洲资源环境与可持续发展重点实验室开放课题项目(GORS202102);国家自然科学基金项目(41661014)。

摘　　要：为研究城市滨河公园景区地表积尘和周边绿地土壤重金属污染状况及潜在生态风险和健康风险,选择兰州市黄河风情线沿线的游园、广场和主题公园为研究区,分别采集了27个地表积尘和26个周边绿地表土样品.采用地累积指数(Igeo)、单因子污染指数(P_(i))、内梅罗综合污染指数(P_(N))和改进的潜在生态风险指数(RI)评估Cr、Ni、Cu、Zn、As、Cd、Hg和Pb这8种重金属污染特征和潜在生态风险程度,并利用暴露风险模型进行健康风险评价.结果表明,研究区地表积尘和周边绿地土壤As含量的平均值略低于甘肃省土壤元素背景值,但地表积尘的其余元素均高于甘肃省和兰州市元素背景值,而周边绿地除Cr和Ni元素略低于甘肃省和兰州市的背景值之外,其余Cu、Zn、Cd、Hg和Pb含量的平均值却高于两者的背景值.地累积指数和单因子污染指数显示,研究区地表积尘受到Cr、Cu、Zn、Cd、Hg和Pb的污染,沿途绿地土壤存在不同程度的Cu、Zn、Cd、Hg和Pb的污染.内梅罗综合污染指数表明,研究区地表积尘和周边绿地土壤的综合污染程度为轻度至重度污染.潜在生态风险指数表明,研究区地表积尘和周边绿地土壤的主要潜在生态危害元素是Cd和Hg,其余元素的潜在生态风险指数值均低于40,为轻微生态危害.健康风险评估显示,手口摄入是研究区地表积尘和周边绿地土壤重金属暴露的最主要途径,且对成人和儿童均不构成非致癌和致癌健康风险.In order to investigate the contamination levels of dust and its surrounding green land soil heavy metal pollution and potential ecological and health risks in the scenic areas of urban waterfront parks,the gardens,squares,and theme parks of the Yellow River Custom Tourist Line in Lanzhou were selected as the research area,using 27 dust samples and 26 soil samples from its surrounding green lands.The contamination characteristics and potential ecological risks of eight heavy metals(Cr,Ni,Cu,Zn,As,Cd,Hg,and Pb)were evaluated using the geo-accumulation index(Igeo),single-factor pollution index(P_(i)),Nemerow integrated pollution index(P_(N)),and improved potential ecological risk index(RI).The human health risk assessment was also evaluated using the exposure risk model.The results showed that the average concentrations of the other heavy metals in the surface dusts were higher than the background values of Gansu Province and Lanzhou City,except that the As mean concentrations in the surface dusts and the surrounding green land soils were slightly lower than the Gansu Province background values.For its surrounding green land soils,the mean concentrations of the other heavy metals(Cu,Zn,Cd,Hg,and Pb)exceeded the soil background values of Gansu Province and Lanzhou City,whereas the Cr and Ni mean concentrations were lower than their corresponding soil background values of Gansu Province and Lanzhou City.The geo-accumulation and single-factor pollution indices demonstrated that a slight to moderate pollution of Cr,Cu,Zn,Cd,Hg,and Pb occurred in surface dusts,and Cu,Zn,Cd,Hg,and Pb appeared in varying degrees of contamination levels in its surrounding green land soils.The Nemerow integrated pollution index analysis manifested that the overall contamination status of the study areas was between slightly and heavily polluted.The potential ecological risk index suggested that Cd and Hg were recognized as significant pollutant elements and that the RI of the other heavy metals were all below 40,presenting slight ecological

关 键 词：积尘 土壤 重金属污染 生态风险 健康风险 黄河风情线 

分 类 号：X53[环境科学与工程—环境工程] X820.4