皖南典型区耕地土壤重金属富集特征、来源识别及健康风险评估

doi:10.11720/wtyht.2024.2595

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Abstract

This study aims to explore the enrichment characteristics and origin of soil heavy metals in typical cultivated land in the mountainous area of southern Anhui province. With Ningguo City in southeastern Anhui Province as the research object, this study collected 1399 topsoil samples in the cultivated land for determining the concentrations of As, Cd, Hg, Pb, Cr, Ni, Cu, and Zn. Furthermore, this study conducted a health risk assessment and source identification of heavy metals using the correlation analysis, the soil environmental quality - risk control standard for soil contamination of agricultural land, the geoaccumulation index, the health risk index, and the positive matrix factorization (PMF) model. The results are as follows: (1) The average concentrations of As, Cr, Hg, Pb, Cr, Ni, Cu, and Zn were 15.8×10^-6, 0.41×10^-6, 0.106×10^-6, 31×10^-6, 67×10^-6, 29×10^-6, 29×10^-6, and 94×10^-6, respectively, which were all higher than their background values in Anhui Province, except Ni. (2) The soil heavy metals generally exhibited low pollution risks, with the heavy metal concentrations of 866 soil samples lower than their risk screening values. (3) The cultivated soil was primarily polluted by Hg, Cd, and As, as indicated by the geoaccumulation index results. (4) Both non-carcinogenic and carcinogenic risk levels in adults in the study area were within the acceptable ranges, as revealed by the health risk assessment results. (5) Four sources of heavy metals in the study area were identified based on the PMF model: industrial and agricultural emissions associated with human activities, atmospheric deposition, soil parent materials related to soil types, and the geological background source.

Key words： cultivated land soil heavy metals health risk PMF model

Received: 30 November 2022 Published: 26 February 2024

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	Articles by authors
	Yan YANG
	Bin LIU
	Fei-Qiang XIA
	Ping-Feng CHEN
	Xiang ZHANG

Cite this article:

Yan YANG,Bin LIU,Fei-Qiang XIA, et al. Enrichment characteristics, source identification, and health risk assessment of soil heavy metals in typical cultivated land in the mountainous area of southern Anhui Province[J]. Geophysical and Geochemical Exploration, 2024, 48(1): 255-263.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.2595 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I1/255

Geographical location (a),soil type (b), and sampling point distribution(c) of the study area
1—Quaternary;2—Cretaceous;3—Jurassic;4—Permian;5—Carboniferous;6—Devonian;7—Silurian;8—Ordovician;9—Cambrian;10—Tanian;11—Nanhua system;12—Yanshanian monzonitic granite;13—Yanshanian monzonitic granite porphyry;14—granite porphyry;15—stratigraphic boundary;16—fault;17—soil sampling points

Analysis methods and detection limits for each element

Classification standard of geoaccumulation index

参数	含义	单位	成人	儿童
$I R 土壤$	土壤摄入量	mg/d	100	200
EF	暴露频率	d/a	350	350
ED	暴露期	a	24	6
BW	平均体重	kg	61.8	19.2
AT	平均作用时间	d	9125	2190
SA	可能接触土壤的皮肤面积	cm²/d	5700	2800
AF	皮肤对土壤的吸附系数	mg/cm²	0.07	0.2
ABS	皮肤吸收率	%	0.1	0.1
PEF	土壤尘产生因子	m³/kg	1.36′10⁹	1.36′10⁹
$I R 空气$	日空气吸入量	m³/d	14.5	7.5

Health risk assessment model exposure parameters

RfD and SF of different heavy metal exposure pathways

Basic statistics of heavy metals in soil

Statistical results of cultivated land soil pollution risk levels in the study area

The proportion of heavy metals in different levels of geo-accumulation index

Correlation analysis of heavy metal content in soil

Source profiles and source contribution of soil heavy metals in the study area from PMF

Factors profiles of heavy metals sources identified by PMF

Space distribution of PMF-factors

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