Adsorption and desorption of Cd in reclaimed soil under the influence of humic acid: characteristics and mechanisms

Yao, Zheng; Zhang, Zhiguo; Chen, Yongchun; An, Shuhong; Zhang, Lei; Chen, Fangling; Ma, Chengnan; Cai, Weiqing

doi:10.1007/s40789-022-00480-6

Cited by 12 publications

(5 citation statements)

References 17 publications

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“…The addition of organic acids led to a decrease in soil pH, which increased the solubility of Pb and contributed to the conversion of the iron–manganese oxide-bound state to the exchangeable state, increasing its effectiveness ( Zhang et al, 2008 ). The organic-bound Pb and residue Pb fraction did not change significantly because the organic-bound state is generally released only under strong oxidation conditions, while the residual state is generally present in the soil lattice of silicates and primary and secondary minerals, which are chemically stable and not easily affected by the external environment ( Zheng et al, 2022 ).…”

Section: Results and Analysismentioning

confidence: 99%

Effect of Low-Molecular-Weight Organic Acids on Migration Characteristics of Pb in Reclaimed Soil

Yao

Li²,

Zhang³

et al. 2022

Front. Chem.

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The effect of low-molecular-weight organic acids (citric acid and malic acid) on the migration characteristics of Pb in contaminated soils was explored in this study. Reclaimed soil was collected from the coal gangue hill area of the Panyi mine in Huainan City (China). The effect of citric acid and malic acid on the form of Pb present in the reclaimed soil was analyzed by spiking soil samples and simulating Pb-contaminated soil. The results indicate the following. 1) With increased concentration of exogenous Pb, the activity of Pb in the reclaimed soil was effectively improved. 2) The addition of citric acid and malic acid both resulted in an increased fraction of exchangeable Pb in the soil, which effectively promoted the active Pb fraction. As the concentrations of citric acid and malic acid increased, the active Pb fraction of the reclaimed soil increased accordingly. The Pb activation effect of citric acid was observed to be greater than that of malic acid. 3) With extended soil aging time, the activation effect of organic acids on Pb weakened, with the loosely bound Pb gradually transforming into strongly bound Pb. Chelating agents can activate heavy metals in soil, mainly through the combination of chelating agents and heavy metal ions in the soil solution to form soluble metal chelates, so as to increase the bioavailability of heavy metals in soil to plant roots. Therefore, adding citric acid can be considered as a strategy to enhance the efficiency of reclaimed soil remediation because of the ability of Pb activation.

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Section: Results and Analysismentioning

confidence: 99%

Effect of Low-Molecular-Weight Organic Acids on Migration Characteristics of Pb in Reclaimed Soil

Yao

Li²,

Zhang³

et al. 2022

Front. Chem.

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“…Mesophilic microbes, such as bacteria and coliforms, exhibit optimal growth within specific temperature ranges. Coliforms, which are commonly found in the intestines of animals and humans, demonstrate optimal growth at temperatures ranging from 30 • C to 40 • C, with the most rapid reproduction occurring at 37 • C. The quantity, metabolism, and activity are subject to change when the temperatures are not conducive to their survival [44][45][46][47][48]. This is consistent with our finding that TBC and TEC values are lower below 30 • C. In summer, with high temperatures, the average groundwater TEC values are approximately seven times higher than in other seasons.…”

Section: The Temperature and Porosity Effects On Groundwater Qualitymentioning

confidence: 99%

Analysis of Pathogen-Microbiota Indicator Responses in Surface Karst Springs under Various Conditions in a Rocky Desertification Area: A Case Study of the Xiaojiang Watershed in Yunnan

Sun,

Wang,

Ning

et al. 2024

Applied Sciences

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The Xiaojiang watershed in Luxi, Yunnan, is a typical rocky desertification area, in which karst groundwater pollution is severe and water resources are scarce. This article takes the watershed as an example and investigates the response mechanisms of surface karst spring water quality to agricultural pollution in rocky desertification areas. Specifically, the study was conducted as follows: (I) A total of 108 water samples from 54 sources were collected during the dry and wet seasons for analysis. (i) Principal component and correlation analyses identified the main pollution indicators in the soil surface karst zone of the area, including total bacterial count, total coliforms, COD, pH, and redox potential. (ii) It was also discovered that surface soil, impacted by agricultural activities, directly contributes to groundwater pollution in the soil surface karst zone. (II) Local soil was used to prepare soil columns under various conditions for simulation. The findings indicate: (i) Temperature significantly affects the surface karst springs, with higher temperatures leading to more pronounced water quality responses, increased enrichment of pathogen-microbiota indicators, and degraded water quality. (ii) Soil porosity substantially influences the water quality of surface karst springs. Increased porosity results in looser soil, more oxidizing conditions in the storage matrix, reduced pathogen-microbiota development, and consequently, less water pollution. This study offers theoretical and technical references for evaluating, monitoring, and issuing early warnings for pathogenic bacteria-microbiota pollution in groundwater in rocky desertification areas.

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“…Zheng et al ( 2022) studies have shown that submersion in different pH level solutions significantly affects the amount of heavy-metal dissolution (Kanokwan et al, 2015;Zheng et al, 2022). Figure 4A shows that when the pH was set at 2.8, 4.9, 5.7, or 6.8, Cu leaching was the highest (0.712 mg/kg, 0.411 mg/kg, 0.221 mg/kg, and 0.291 mg/kg, respectively), while at pH 3.9, Ni exhibited the highest level of leaching (0.399 mg/kg).…”

Section: Effect Of Ph On Fly Ash Heavy-metal Leachingmentioning

confidence: 99%

Ecological Risk Assessment and Influencing Factors of Heavy-Metal Leaching From Coal-Based Solid Waste Fly Ash

Zhang

Cai

et al. 2022

Front. Chem.

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In order to promote and broaden the utilization of fly ash as a resource, the fly ash from a 2,660-MW coal-fired power plant in Huainan (China) was investigated. The physical and chemical properties of fly ash were characterized by scanning electron microscopy, energy spectrum analysis, and XRD. The content and different forms of the heavy metals Cd, Cr, Cu, Co, and Ni were determined by acid digestion, oscillation leaching, and Tessier five-step extraction. The effect of pH, temperature, and particle size on the leached amount of heavy metals was studied. Finally, the ecological risk index was calculated for each heavy metal via the risk assessment coding (RAC) method and Hakanson ecological risk assessment method, allowing the ecological risk of fly ash to be determined under different environmental conditions. Results showed that the average concentrations of Cd, Cr, Co, and Ni were all below the risk screening values reported for environmental pollutants (pH > 7.5). Under varying pH, temperature, and particle size conditions, the leached amounts (oscillation leaching) were below the soil risk screening values for agricultural land in China. An RAC-Cd value of >50% indicates a high ecological risk, while the RAC values of Co and Ni were between 10 and 30%, indicating a medium ecological risk, and the RAC values of Cr and Cu were <10%, indicating a low ecological risk. With increasing pH, the potential ecological risk index (RI) decreased, with a maximum RI of 59.62 observed at pH 2.8. With increasing temperature, the potential ecological RI increased initially to a maximum of 27.69 at 25°C and then decreased thereafter. With increasing particle size, the ecological RI decreased, with the highest RI of 4.06 occurring at <0.075 mm. The Hakanson ecological RI value was below 150, indicating a slight ecological risk. Therefore, fly ash can be considered as a soil additive and conditioner that is suitable for use in the improvement of reclamation soil in coal mining subsidence areas.

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Adsorption and desorption of Cd in reclaimed soil under the influence of humic acid: characteristics and mechanisms

Cited by 12 publications

References 17 publications

Effect of Low-Molecular-Weight Organic Acids on Migration Characteristics of Pb in Reclaimed Soil

Effect of Low-Molecular-Weight Organic Acids on Migration Characteristics of Pb in Reclaimed Soil

Analysis of Pathogen-Microbiota Indicator Responses in Surface Karst Springs under Various Conditions in a Rocky Desertification Area: A Case Study of the Xiaojiang Watershed in Yunnan

Ecological Risk Assessment and Influencing Factors of Heavy-Metal Leaching From Coal-Based Solid Waste Fly Ash

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