Ecological Risk Assessment of PAHs in a Karst Underground River System
Jiacheng Lan 1  
,   Yuchuan Sun 2  
,   Xinyi Xiang 2  
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School of Karst Science, State Engineering Technology Institute for Karst Desertification Control, Guizhou Normal University, Guiyang, China
Chongqing Key Laboratory of Karst Environment, School of Geographical Science, Southwest University, Chongqing, China
Yuchuan Sun   

Chongqing Key Laboratory of Karst Environment / School of Geographical Science, Southwest University, Chongqing , China, China
Submission date: 2018-11-07
Final revision date: 2019-01-11
Acceptance date: 2019-01-29
Online publication date: 2019-09-10
Publication date: 2019-12-09
Pol. J. Environ. Stud. 2020;29(1):677–687
Ecological risk assessment of sixteen priority polycyclic aromatic hydrocarbons was conducted for water, sediment and topsoil from a karst underground river system in Chongqing in southwestern China. The ecological risk of PAHs was assessed by risk quotient method based on toxic equivalency factors. The results indicated that PAHs widely showed moderate risk in sediments and topsoil, and moderate risk or high risk in water, presented higher risk in water than that in topsoil and sediment, and were shown to be higher in groundwater than in surface water, and demonstrated highly vulnerable contamination by PAHs in the karst system. Low molecular weight PAHs were identified to be a much more ecological risk burden than high molecular PAHs than high molecular weight PAHs in the Laolongdong underground river system.