Accumulation and Pollution Risks of Heavy Metals in Soils and Agricultural Products from a Typical Black Shale Region with High Geological Background

被引：0

作者：

Deng S. ^{[1
]}

Duan J.-H. ^{[2
]}

Ning M.-H. ^{[2
]}

Tan L. ^{[2
]}

Pu G. ^{[1
]}

Chen J.-X. ^{[1
]}

Qi X.-B. ^{[1
]}

Jiang S.-Z. ^{[1
]}

Xie T.-Y. ^{[1
]}

Liu Y.-Z. ^{[3
]}

机构：

[1] No. 205 Geological Team, Chongqing Bureau of Geology and Minerals Exploration, Chongqing

[2] Chongqing Institute of Geological Survey, Chongqing

[3] State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang

来源：

Huanjing Kexue/Environmental Science | 2023年 / 44卷 / 04期

关键词：

cadmium (Cd); food crops; high geological background; selenium (Se); soil; speciation;

D O I：

10.13227/j.hjkx.202205155

中图分类号：

学科分类号：

摘要：

Soil polluted by heavy metals (HMs) is an important environmental issue in China, and regional geological background is a vital factor that influences the enrichment of HMs in soils. Previous studies have shown that soils derived from black shales are commonly enriched in HMs and present high potential eco-environmental risks. However, few studies have investigated the HMs in different agricultural products, which inhibit the safe use of land and safe production of food crops in black shale regions. This study investigated the concentrations, pollution risks, and speciation of HMs in soils and agricultural products from a typical black shale region in Chongqing. The results showed that the study soils were enriched in Cd, Cr, Cu, Zn, and Se but not in Pb. Approximately 98. 7% of total soils exceeded the risk screening values, and 47. 3% of total soils exceeded the risk intervention values. Cd had the highest pollution level and potential ecological risks and was the primary pollutant in soils of the study area. Most of the Cd resided in ion-exchangeable fractions (40. 6%), followed by residual fractions (19. 1%) and weak organic matter combined fractions (16. 6%), whereas Cr, Cu, Pb, Se, and Zn were dominated by residual fractions. Additionally, organic combined fractions contributed to Se and Cu, and Fe-Mn oxide combined fractions contributed to Pb. These results indicated that Cd had higher mobility and availability than those of other metals. The agricultural products presented a weak ability to accumulate HMs. Approximately 18. 7% of the collected samples with Cd exceeded the safety limit, but the enrichment factor was relatively low, indicating low pollution risks of the heavy metals. The findings of this study could provide guidelines for safe use of land and safe production of food crops in black shale regions with high geological background. © 2023 Science Press. All rights reserved.

引用

页码：2234 / 2242

页数：8

共 41 条

[1] Zhao F J, Ma Y B, Zhu Y G, Et al., Soil contamination in China: current status and mitigation strategies [ J ], Environmental Science & Technology, 49, 2, pp. 750-759, (2015)
[2] Luo Y M, Teng Y., Regional difference in soil pollution and strategy of soil zonal governance and remediation in China, Bulletin of Chinese Academy of Sciences, 33, 2, pp. 145-152, (2018)
[3] Liu X Y, Fan Y N, Liu P, Et al., Characteristics of heavy metals pollution in farmland soil of the Yangtze Rivereconomic belt based on bibliometric analysis, Environmental Science, 43, 11, pp. 5169-5179, (2022)
[4] Xia X Q, Ji J F, Zhang C S, Et al., Carbonate bedrock control of soil Cd background in Southwestern China: its extent and influencing factors based on spatial analysis[ J], Chemosphere, 290, (2022)
[5] Chen T Y, Zhao H F, Wu K N, Et al., Distributional characteristics and source identification of cadmium in soils of the Pearl River Delta, China [ J ], Bulletin of Environmental Contamination and Toxicology, 106, 1, pp. 75-85, (2021)
[6] 63, 1, (2022)
[7] Mu D M, Sun Y B., Safety production threshold and land quality classification of vegetable Pb in high geological background area of southwest China, Environmental Science, 43, 2, pp. 965-974, (2022)
[8] Duan Y R, Yang Z F, Yu T, Et al., Geogenic cadmium pollution in multi-medians caused by black shales in Luzhai, Guangxi, Environmental Pollution, 260, (2020)
[9] Yang Q, Yang Z F, Zhang Q Z, Et al., Transferability of heavy metal(loid)s from karstic soils with high geochemical background to peanut seeds, Environmental Pollution, 299, (2022)
[10] Zhu L L, Wang F P, Tang L B, Et al., Accumulation effects and health risks of heavy metals in rice in location-based cadmium anomaly area in Liuzhou[J], Environmental Science, 43, 8, pp. 4219-4231, (2022)

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