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Distribution Characteristics, Source Apportionment and Risk Assessment of Heavy Metals along Guihuang Highway, Guizhou, China (Vol. 49, No.2, Tot No.340 2021) TEXT SIZE: A A A

HE Benqing1,2,WANG Zhongwei1,2,ZHANG Ting3, LIU Jianfeng1,2,LIU Yulong1,2, LIANG Zhongxuan1,2, TAO Faxiang1, LIU Xiaojing4,CHEN Jiubin3,*

(1. State key laboratory of environmental geochemistry, institute of geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Institute of Surface-Earth System Science, Tianjin university, Tianjin 300072, China;
4. Environmental engineering assessment center of Guizhou province, Guiyang 550002, China)

Abstract: In this study, we analyzed concentrations of heavy metal elements Cr, Cd, Cu, Zn and Pb in dust, soil and plant samples collected along the Guihuang Highway, in Guizhou province, China, with a goal to better identify the distribution characteristics and impact of highway emission on the surround environments. Zn isotope composition was also measured to confirm the contributing sources. Our results showed significant enrichments of heavy metals in dust and soils along the highway, and main sources of these heavy metals is the wear of tires and brake pads. Geoaccumulation index and potential ecological risk index methods were employed to evaluate the degree of heavy metal pollution and the risk level of environmental ecologic impact. Amongst these investigated heavy metals, Zn was the element with the highest enrichment. All metals Cr, Zn, Cu, Cd and Pb had certain risks and displayed harms to the environment, reaching medium or low risk level, while Cd would possess the highest threat to the environment.

Keywords: heavy metal; highway; distribution pattern; zinc isotopes; environmental ecological risk

EARTH AND ENVIRONMENT Vol.49, No.2, Tot No.340, 2021, Page 164-171

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