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    Rights statement: This is the author’s version of a work that was accepted for publication in Chemosphere. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Chemosphere, 300, 2022 DOI: 10.1016/j.chemosphere.2022.134502

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Distribution, sources and transport of polycyclic aromatic hydrocarbons (PAHs) in karst spring systems from Western Hubei, Central China

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  • Wei Chen
  • Ziqiong Zhang
  • Ying Zhu
  • Xianzhen Wang
  • Longliang Wang
  • Junwu Xiong
  • Zhe Qian
  • Shuai Xiong
  • Ruichao Zhao
  • Wei Liu
  • Qiuke Su
  • Jiangang Zhou
  • Hong Zhou
  • Shihua Qi
  • Kevin C. Jones
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Article number134502
<mark>Journal publication date</mark>31/08/2022
<mark>Journal</mark>Chemosphere
Volume300
Number of pages10
Publication StatusPublished
Early online date8/04/22
<mark>Original language</mark>English

Abstract

Karst groundwater is an important water resource but it is vulnerable to contaminants, due to the distinctive geological features of abundant transmissive fractures and conduits which connect the surface to the underground system. Anthropogenic activity-derived polycyclic aromatic hydrocarbons (PAHs) on the surface environment could enter groundwater easily and rapidly and threaten water security in karst areas. Samples in the multimedia environment from 10 specific karst spring systems from Western Hubei of Central China were collected to analyze 16 priority PAHs and to investigate their transport in these karst spring systems. The total concentrations of PAHs in the soil, river water, river sediments, spring water, and spring sediments ranged between 6.04 and 67.7 ng g−1, 4.56 and 11.4 ng L−1, 29.9 and 1041 ng g−1, 4.09 and 222 ng L−1, and 5.88 and 83.0 ng g−1, respectively. Levels of PAHs in this area were relatively low when compared to other karst areas. Proportions of low-molecular-weight (LMW)-PAHs in the water, sediments and soil (average 58.2–78.8%) were much higher than those of high-molecular-weight (HMW)-PAHs. The proportion of LMW-PAHs in the sediments (especially in river sediments) was higher than that in the soil. Characteristic ratios analysis and principal component analysis showed that PAHs were from high-temperature combustion of the mixture of coal and biomass, and vehicle emission, where coal and biomass combustion are the dominant sources. Significant correlations of PAHs compositions in different media of karst spring systems were observed, especially in the Yuquangdong (YQD), Jiuzhenziquan (JZZQ), Xianyudong (XYD) and Fengdong (FD) karst spring systems, indicating the rapid PAH transport from the recharge area soil to the discharge area of spring water and sediments.

Bibliographic note

This is the author’s version of a work that was accepted for publication in Chemosphere. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Chemosphere, 300, 2022 DOI: 10.1016/j.chemosphere.2022.134502