ORIGINAL RESEARCH
Ecological Risk Assessment of Heavy
Metals in Rainfall Runoff of Different Land
Use Types in Wuhu City
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1
College of Civil Engineering and Architecture, Anhui Polytechnic University, Wuhu 241000, China
2
Engineering Research Center of Anhui Green Building and Digital Construction,
Anhui Polytechnic University, Wuhu 241000, China
3
Shanghai Municipal Engineering Design Institute, Shanghai 310000, China
Submission date: 2024-03-21
Final revision date: 2024-07-06
Acceptance date: 2024-08-15
Online publication date: 2024-11-07
Publication date: 2025-11-14
Corresponding author
Sheng Xie
Shanghai Municipal Engineering Design Institute, China
Pol. J. Environ. Stud. 2025;34(6):8213-8228
KEYWORDS
TOPICS
ABSTRACT
With the rapid development of urbanization, heavy metal pollution resulting from runoff has
increased and also varies significantly according to different land uses. Research is still lacking,
however, on the risk assessment of heavy metals carried by the runoff. In the Wuhu urban area, we
selected seven types of land use, i.e., road square land, green land, commercial land, residential land,
industrial land, public building land, and dock land, to monitor the content of copper (Cu), cadmium
(Cd), and lead (Pb) in rainfall runoff. Furthermore, we evaluated the ecological risk of these three
heavy metals by risk quotient (RQ), which was developed on the basis of the predicted no-effect
concentration (PNEC) obtained by the species sensitivity distribution (SSD) curve. According to
the event mean concentration (EMC) of four effective rainfall events, compared with the Environmental
Quality Standard for Surface Water (GB 3838–2002), the statistical results showed that Cu, Cd, and Pb
in the rainfall runoff met Class II, IV, and V water quality standards, respectively, which were affected
mainly by the traffic activities and roofing materials in different types of land use. Industrial land has
experienced the worst pollution from all three of these heavy metals, and the other areas have been
polluted to different degrees by different heavy metals, which has resulted in significant differences
in toxicity to aquatic organisms. Generally, the ecological risks posed by heavy metals in rainfall runoff
have a high-risk degree, in the order of Cd < Pb < Cu. The ecological risk of Cu and Pb to freshwater
organisms is high, and that of Cd is medium. Therefore, the current environmental quality standard
for surface water in some areas like Wuhu City, China, has not fully considered the ecological impact
and has underestimated the ecological risks of heavy metals.
CONFLICT OF INTEREST
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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