REVIEW PAPER
Sedimentary Records and Ecological Risks
of Organochlorine Pesticides
in the Sediments of Qingshui River
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1
School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China
2
School of Civil and Conservancy Engineering, Ningxia University, Yinchuan 750021, China
3
School of Life Science, Ningxia University, Yinchuan 750021, China
4
The Yellow River Water Conservancy Commission Ningmeng Hydrology and Water Resources Bureau,
Baotou 014000, China
Submission date: 2024-10-25
Final revision date: 2025-03-08
Acceptance date: 2025-03-17
Online publication date: 2025-04-22
Publication date: 2026-04-21
Corresponding author
Weijiang Zhang
School of Civil and Conservancy Engineering, Ningxia University, Yinchuan 750021, China
Pol. J. Environ. Stud. 2026;35(2):2685-2699
KEYWORDS
TOPICS
ABSTRACT
In this study, considering the first-level tributary of the Ningxia section of the Yellow River
(Qingshui River) as the study area, 210 sediment samples were collected during the seasons in 2018.
The distribution characteristics, sources, deposition records, and ecological risks of organochloride
pesticides (OCPs) were studied using a 25-cm sedimentation column. Results revealed that 19 types of
OCPs were detected in the Qingshui River sediments with detected (average) contents of n.d. ~36.527
(2.061) ng×g−1 and a detection rate of 79.05%. The OCPs in the sediments of the entire basin increased
with increasing deposition depth. A distinct pollution peak was observed in the deposition depth range
of 15-20 cm (1985-1993); the DDT and endosulfan contents considerably changed with increasing
deposition depth. Pollution peaks appeared at 15-20 cm (1985-1993) and 10-15 cm (1993-2001).
The component analysis results show that OCPs mainly originated from historical residues; however,
in recent years, small amounts of lindane, dicofol, endosulfan, and chlordane compounds were noted
in the local environment. Using the low-effect range and median method for potential ecological
risk assessment, endosulfan was determined to have potential ecological risks, particularly at depths
of 5-10 cm, thereby requiring attention and further research.
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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