重庆市秀山县北部大气干湿沉降重金属元素分布特征及来源分析

doi:10.11720/wtyht.2024.2432

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Abstract

This study aims to determine the contents of heavy metals from dry and wet atmospheric deposition in northern Xiushan County for targeted environmental pollution prevention and control and safe farmland soil utilization. Based on the dry and wet atmospheric deposition samples continuously received from 18 sampling sites in northern Xiushan County from November 2019 to November 2020, this study tested the contents of seven heavy metal elements, including Cd, Cr, Cu, Ni, Pb, Zn, and Hg. Considering the topographic features, this study analyzed the distribution patterns and sources of heavy metals from dry and wet atmospheric deposition in northern Xiushan County. Moreover, this study assessed the soil pollution caused by heavy metals from dry and wet atmospheric deposition using the geoaccumulation index method. The results show that except Hg, the other six heavy metal elements exhibited significant zoning, with their high-value deposition areas distributed primarily in the flanks and eastern segment of Chuanhegai, where their contents were much higher than the national and Chongqing's averages. In contrast, their depositional fluxes in other general deposition areas were less than the national averages by 25%. The high dry and wet atmospheric deposition in the flanks of Chuanhegai was subjected to both the mining of the lead-zinc deposit in Huayuan County in the east and the special topography. The abrupt topography increased the fluxes of the seven heavy metals in the dry and wet atmospheric deposition by 49 times. Therefore, the monitoring and assessment of environmental safety in this type of landform area should be strengthened. According to the assessment results of the geoaccumulation index method, the flanks of Chuanhegai were moderately-severely to extremely polluted by Cd, slightly-moderately polluted by Pb, and slightly-moderately to severely polluted by Zn.

Key words： dry and wet atmospheric deposition heavy metal source analysis Xiushan

Received: 29 August 2022 Published: 26 February 2024

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	Articles by authors
	Ke-Ke CAI
	Zhi-Qiang ZHAO
	Li MENG
	Xiao-Meng WANG
	Jian LIU
	Ren-Feng LUO

Cite this article:

Ke-Ke CAI,Zhi-Qiang ZHAO,Li MENG, et al. Distribution characteristics and source analysis of heavy metals from dry and wet atmospheric deposition in northern Xiushan County, Chongqing[J]. Geophysical and Geochemical Exploration, 2024, 48(1): 237-244.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.2432 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I1/237

Study area and distribution of atmospheric dust sampling sites

Symbol diagram of heavy metal element deposition flux at various points
Note:blue points are below 25% percentile;green points are in 25%~50% percentile;orange points are in 50%~75% percentile;rose points are in 75%~90% percentile;red points are above 90% percentile

Flux of heavy metals in atmospheric dry and wet deposition mg·(m²·a)^-1

The content of heavy metal elements in the soil around the atmospheric dry and wet deposition sample site 10^-6

Proportion comparison of heavy metals between JC10、JC11、JC16、JC17 and soil of Chuanhegai

Section of atmospheric dry and wet deposition points

Geoaccumulation index of atmospheric dry and wet deposition in two wings of Chuanhegai

Surface soil and crop sample points around JC11 within 1 km

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