汉江上游水体沉积物污染状况分析与评价

doi:10.11720/wtyht.2023.1433

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Abstract

To ascertain the pollution characteristics and source of sediments in the upper reaches of the Hanjiang River, this study collected sediment samples at 17 sampling sites in the study area. Based on these samples, this study determined the concentrations of organochlorine compounds (α-666;β-666;γ-666;δ-666;4,4'-DDE;4,4'-DDD;2,4'-DDT; and 4,4'-DDT) and heavy metals (V, Cr, Mn, Co, Ni, Cu, Zn, As, Cd, and Pb) in the sediments. Then, it assessed the heavy metal pollution using the geoaccumulation and potential ecological risk indices. Furthermore, through redundancy analysis and multivariate statistical analysis, this study explored the sources of heavy metals and the relationships between the physicochemical properties of the sediments and heavy metals concentrations. The results indicate that: (1) The organochlorine compounds in the sediments at all sampling sites show low concentrations, without affecting the ecological environment. However, attention should be paid to the pollution caused by organochlorine compounds; (2) All the heavy metals from the sampling sites show non-pollution or mild pollution, except for Cd, which caused slightly strong pollution; (3) As revealed by the analysis of potential ecological risks, heavy metals generally show extremely high potential risks. Cd, which causes the most serious environmental pollution at the sampling sites, serves as the main factor influencing the environmental and ecological risks in the study area; (4) The redundancy analysis shows that there is no significant relationship between the physicochemical properties of sediments and the concentrations of heavy metals in the study area; (5) As revealed by the multivariate statistical analysis, Cd and Pb may be related to the application of agricultural materials (e.g., chemical fertilizers and pesticides) and the discharge of waste gas, wastewater, and industrial residue, indicating anthropogenic sources; the concentrations of V, Cr, Mn, Co, Ni, Cu, Zn, and As are related to the natural weathering of rocks mainly and to industrial wastewater and agricultural activities partially, indicating dominant natural sources. The comprehensive study shows that the potential ecological hazards caused by heavy metals (dominated by Cd) in the sediments should be treated seriously.

Key words： upper reaches of the Hanjiang River sediment organochlorine compound heavy metal pollution risk assessment

Received: 29 August 2022 Published: 27 October 2023

ZTFLH:

X820.4

Corresponding Authors: SONG Feng-Min E-mail: yc1487819481@163.com;sfm3297@163.com

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	Articles by authors
	Chan YANG
	Juan-Juan WU
	Xu-Xi CHE
	Si-Yu YUE
	Zhi-Feng LIU
	Feng-Min SONG

Cite this article:

Chan YANG,Juan-Juan WU,Xu-Xi CHE, et al. Pollution analysis and assessment of sediments in the upper reaches of the Hanjiang River[J]. Geophysical and Geochemical Exploration, 2023, 47(5): 1361-1370.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.1433 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I5/1361

Distribution of sediment sampling sites in the upper reaches of Hanjiang River

Contamination level of sediment by heavy metals classified based on I_geo

Classification standards of potential ecological risk assessment

Distribution of heavy metal concentrations in soils

The statistics of results of heavy metals in surface sediments of the upper reaches of Hanjiang River(n=17)

Physical and chemical properties of sediments

The geo-accumulation index of heavy metals in surface sediment of the upper reaches of Hanjiang River

Potential ecological risk coefficient of heavy metals in surface sediments in the upper reaches of Hanjiang River

Pearson correlation coefficient between heavy metal content and physical and chemical properties of sediments

Principal component analysis of heavy metals in sediments

Initial factor load matrix of heavy metals in sediments

Tree diagram of systematic cluster analysis of heavy metals

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