Potential Ecological Risk Assessment of Heavy Metals in the Fe–Mn Nodules in the Karst Area of Guangxi, Southwest China

Ji, Wenbing; Yang, Zhongfang; Yu, Tao; Yang, Qiong; Wen, Yubo; Wu, Tiansheng

doi:10.1007/s00128-020-02837-6

Cited by 33 publications

(24 citation statements)

References 29 publications

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“…Iron oxide in soil has a strong adsorption capacity for heavy metals and can effectively fix heavy metals (Ran et al, 2014;Qiao et al, 2020). Only under extremely acidic conditions (pH ≤ 3) can heavy metals in Fe-Mn nodules be dissolved (Ji et al, 2021). Iron spots formed by the strong iron redox reaction in the rice rhizosphere can isolate heavy metals on the root surface…”

Section: Definition and Identification Of The Soil Resilience Indexmentioning

confidence: 99%

Safe utilization of cultivated land in high-risk areas of soil heavy metal pollution based on soil resilience

Song

Zhang

et al. 2022

Front. Environ. Sci.

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With global urbanization and industrialization, environmental pollution and food safety problems caused by soil heavy metal pollution occur frequently. To realize the safe utilization of cultivated land resources in high-risk areas of heavy metal pollution, we present an approach to safe utilization classification and management in this study. A typical agricultural area around industrial and mining enterprises located in the economic belt of the Yangtze River Delta was chosen as the research area with cultivated soil as the research object. A total of 1,139 geochemical survey sampling sites and soil survey data were used for this research. Initially, the potential ecological risk index was used to assess the potential ecological risk of heavy metals in cultivated soil, and key soil physical and chemical indicators were chosen to assess soil resilience. Next, the safe utilization classification of cultivated land was carried out by combining the potential ecological risk of soil heavy metals with soil resilience. Then, the specific classification management strategy was developed according to ecological risk factor types and crop types. The results showed that the production and operation activities of industrial and mining enterprises in the study area contributed significantly to soil Cd and Hg pollution, and the potential ecological risk of heavy metals in the surrounding soil was high. The soil resilience of cultivated land in the study area was generally not high. The clay content and cation exchange capacity (CEC) were the main strong restrictive indicators, while CaO, soil organic carbon (SOC), and pH were the main medium restrictive indicators. Natural conditions such as topography, hydrogeology, and soil-forming parent material differed by region, resulting in different restrictive factors. There were 16 safe utilization types in the study area. Different management strategies were proposed based on various soil potential ecological risks, soil resilience, ecological risk factor types, and crop types. This study can offer fresh perspectives on the safe utilization classification and management of land resources in high-risk areas of soil pollution and serve as a reference for sustainable intensification.

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Section: Definition and Identification Of The Soil Resilience Indexmentioning

confidence: 99%

Safe utilization of cultivated land in high-risk areas of soil heavy metal pollution based on soil resilience

Song

Zhang

et al. 2022

Front. Environ. Sci.

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“…China has the world's largest karst area 18 , and Guangxi, as one of the largest karst provinces in China, has widespread distribution of carbonate rocks. The karst topography in karst regions leads to the leaching of parent rocks, enrichment of PTEs, and elevated background levels of PTEs in the soil 19 . However, there are few studies on the baseline values and enrichment status of PTEs based on different geological units, soil types, and land-use practices.…”

Section: Introductionmentioning

confidence: 99%

Exposure to arsenic and other potentially toxic elements: health risk assessment and source analysis in the Wuming Basin, Guangxi Province, China

Hu,

Li,

Liu

et al. 2024

Sci Rep

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Guangxi, China, is one of the world's largest karst regions where potential toxic elements tend to accumulate, resulting in high soil background values. This study explores the ecological risk, elemental baseline values, and sources of potential toxic elements in karst regions, expanding the research to include 21 common elements. The significance of this research lies in its implications for the management of potential toxic element pollution, the formulation of environmental quality standards, and soil remediation in karst areas. In this study, 12,547 topsoil samples (0–20 cm) were collected in the study area. Pollution assessment and ecological risk evaluation of eight potential toxic elements (Zn, Ni, Cu, Pb, Cd, Hg, Cr, and As) were conducted using the geo-accumulation index method and potential ecological risk index method. Multivariate statistical analysis was applied to analyze the total content of 21 common elements (Zn, Ni, Cu, Pb, P, Cd, Hg, Co, Mn, Cr, V, I, S, As, pH, Se, N, CaO, Corg, Mo, and F). Additionally, the potential sources of 21 soil elements were preliminarily quantitatively analyzed using the principal component analysis-absolute principal component scores-multiple linear regression receptor model. The results showed that (1) Zn, Ni, Cu, Pb, Cd, Cr, V, and As were enriched in the research area and Ca, Cd, Mn, Mo, Hg, As, and Cu might have been influenced by human activities; (2) Cr, Pb, As, and Zn were generally lightly polluted, with Hg having a moderate potential ecological risk level; and (3) Ni and Zn have contributions of 37.99% and 35.07% from geological sources, agricultural fertilization, and pesticides. Mo, V, Cr, Se, Hg, and As exhibit contributions ranging from 39.44 to 59.22% originating from geological backgrounds and human activities. Corg, S, N, and P show contributions of 45.39% to 80.33% from surface vegetation. F, Co, Mn, and Pb have contributions ranging from 31.63 to 47.93% from acidic rocks in the soil parent material, mining activities, and transportation. Cd and CaO derive 31.67% and 40.23%, respectively, from soil parent material and industrial sources. I has 31.94% from geological background and human activities, and 31.95% from soil parent material and atmospheric sources. Cu has 30.56% from geological sources. The study results can serve as a scientific basis for element research in karst areas domestically and internationally.

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“…Recent studies have verified that the combination of secondary enrichment and parental rock inheritance is responsible for the high accumulation of As in Guangxi's karstic soil [6]. Fe-Mn nodules are present in many agricultural soils in the karst areas of Guangxi, China [28,29]. Fe-Mn nodules share a common origin with the surrounding soils and are formed in situ by the cementation of Fe-(oxyhydr)oxides to the soil matrix components.…”

Section: Introductionmentioning

confidence: 99%

Arsenic in a Karstic Paddy Soil with a High Geochemical Background in Guangxi, China: Its Bioavailability and Controlling Factors

Li,

Ma,

Hou

et al. 2024

Applied Sciences

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Arsenic (As) is of widespread concern, as its elevated contents in soil and water have a serious impact on the ecological environment and human health. Soils in karst regions are characterized by a high geochemical background of As. However, the bioavailability of As in paddy soils and the potential risk of As transfer from the soil to rice remain unclear. In this study, 305 paired soil–rice samples were collected from karst regions in Guangxi, China, in order to examine the controlling variables and As bioavailability in the soil–rice system. According to this study, the karst region’s paddy soil had higher As concentrations than the non-karst region’s paddy soil. The As concentration in the rice grains was low, with only 0.62% of the rice samples exceeding the permissible value of inorganic As (0.2 mg/kg). Arsenic in the karstic paddy soils existed mainly in the residual fraction, while the water-soluble and exchangeable fractions, which are readily absorbed by rice, accounted for a relatively small proportion. The high content but low bioavailability of As in the karstic paddy soil was mostly attributed to the abundant Fe–Mn nodules, which contributed 64.45% of the As content in the soil. Within the Fe–Mn nodules, As was primarily bound to Fe-(oxyhydr)oxides, which could be released into the paddy soil under certain reduction conditions via the reductive dissolution of Fe-(oxyhydr)oxides. Under the natural pH conditions of the karstic paddy soil (pH 4.9–8.38), the leaching of As was almost negligible, and As could be steadily retained within the Fe–Mn nodules. However, extremely acidic or alkaline conditions promoted the release of As from the Fe–Mn nodules.

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Potential Ecological Risk Assessment of Heavy Metals in the Fe–Mn Nodules in the Karst Area of Guangxi, Southwest China

Cited by 33 publications

References 29 publications

Safe utilization of cultivated land in high-risk areas of soil heavy metal pollution based on soil resilience

Safe utilization of cultivated land in high-risk areas of soil heavy metal pollution based on soil resilience

Exposure to arsenic and other potentially toxic elements: health risk assessment and source analysis in the Wuming Basin, Guangxi Province, China

Arsenic in a Karstic Paddy Soil with a High Geochemical Background in Guangxi, China: Its Bioavailability and Controlling Factors

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