Distribution, source investigation, and risk assessment of topsoil heavy metals in areas with intensive anthropogenic activities using the positive matrix factorization (PMF) model coupled with self-organizing map (SOM)

Jiang, Wenjuan; Lishan, Meng; Liu, Futian; Sheng, Yizhi; Chen, Sheming; Yang, Jilong; Mao, Hairu; Zhang, Jing; Zhang, Zhuo; Ning, Hang

doi:10.1007/s10653-023-01587-8

Cited by 37 publications

(15 citation statements)

References 78 publications

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“…According to the definition of “source zone” and the leakage situation of LNAPL, LNAPL is typically present in both the vadose zone and the saturated zone. A portion of contaminants will dissolve into the groundwater and form a contaminant plume that migrates downstream, while another portion will volatilize upward through the vadose zone [ 34 , 35 ]. During the physical processes of dissolution and volatilization, significant biodegradation occurs at the bottom of the saturated zone and vadose zone due to the activity of methanogenic bacteria.…”

Section: Methodsmentioning

confidence: 99%

Assessing the Natural Source Zone Depletion of a Petroleum-Contaminated Clayey Soil Site in Southern China Combining Concentration Gradient Method and Metagenomics

Xu,

Zhang,

Ning

et al. 2024

Life

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Natural source zone depletion (NSZD) is the main process of LNAPL (Light Non-Aqueous Phase Liquid) removal under natural conditions. The NSZD rates assessed ranged from 0.55 to 11.55 kg·m−2·a−1 (kilograms per square meter per year) in previous studies. However, most of these data were obtained from sandy sites, with few clayey sites. To gain knowledge of NSZD in clayey soil sites, the study assessed the NSZD of a petroleum hydrocarbon-contaminated clayey soil site in China, combining the concentration gradient method with metagenomic sequencing technology. The results show that the abundance of methane-producing key enzyme mcrA gene in the source zone was more abundant than in background areas, which suggests that there was methanogenesis, the key process of NSZD. The concentration gradients of oxygen and carbon dioxide existed only in shallow soil (<0.7 m), which suggests that there was a thin methane oxidation zone in the shallow zone. The calculated NSZD rates range from 0.23 to 1.15 kg·m−2·a−1, which fall within the moderate range compared to previous NSZD sites. This study expands the knowledge of NSZD in clayey soil and enriches the attenuation rate data for contaminated sites, which is of significant importance in managing petroleum contaminants.

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Section: Methodsmentioning

confidence: 99%

Assessing the Natural Source Zone Depletion of a Petroleum-Contaminated Clayey Soil Site in Southern China Combining Concentration Gradient Method and Metagenomics

Xu,

Zhang,

Ning

et al. 2024

Life

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“…39 As, a naturally occurring element in the Earth's crust, is released into the environment through a variety of human activities, including mining, agricultural practices, automobile exhaust and industrial dust, wood preservatives, and dyes. 40 Soil plays a vital role in supporting terrestrial ecosystems and their biodiversity. Heavy metals are prevalent pollutants within the soil environment, and their presence can adversely affect microorganisms, plants and animals.…”

Section: The Principal Sources Of Pollutionmentioning

confidence: 99%

“… 39 As, a naturally occurring element in the Earth’s crust, is released into the environment through a variety of human activities, including mining, agricultural practices, automobile exhaust and industrial dust, wood preservatives, and dyes. 40 …”

Section: The Principal Sources Of Pollutionmentioning

confidence: 99%

Heavy Metal Pollution in the Environment and Its Impact on Health: Exploring Green Technology for Remediation

Das,

Sultana,

Ndhlala

et al. 2023

Environ�Health�Insights

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Along with expanding urbanization and industrialization, environmental pollution which negatively affects the surroundings, has been rising quickly. As a result, induces heavy metal contamination which poses a serious threat to living organisms of aquatic and soil ecosystems. Therefore, they are a need to ameliorate the effects cost by cost pollution on the environment. In this review, we explore methods employed to mitigate the effects caused by heavy metals on the environment. Many techniques employed to manage environmental pollution are tedious and very costly, necessitating the use of alternative management strategies to resolve this challenge. In this concept, bioremediation is viewed as a future technique, due to its environmental friendliness and cost-effective measures aligned with sustainable or climate-smart agriculture to manage contaminants in the environment. The technique involves the use of living entities such as bacteria, fungi, and plants to deteriorate toxic substances from the rhizosphere. Currently, bioremediation is thought to be the most practical, dependable, environmentally benign, and long-lasting solution. Although bioremediation involves different techniques, they are still a need to find the most efficient method for removing toxic substances from the environment. This review focuses on the origins of heavy metal pollution, delves into cost-effective and green technological approaches for eliminating heavy metal pollutants from the environment, and discusses the impact of these pollutants on human health.

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“…Carbonate rocks are supersaturated calcium bicarbonate solutions in nature that are precipitated from water. Carbonate reservoirs account for about 60% of the global remaining oil reserves, mainly including limestone and dolomite carbonate rock types, , among which calcite mineral composition accounts for a relatively high proportion. , As the heterogeneity of carbonate reservoirs is usually high and the surface has strong oil wetness, the increment of oil production in ordinary water flooding is usually very low, so we consider changing the composition of water flooding and adopting low-salinity solution to displace the remaining oil in the reservoir to increase oil production.…”

Section: Introductionmentioning

confidence: 99%

Effects of Sulfate Ions on Crude Oil Adsorption/Desorption on Carbonate Rocks: Experimental and Molecular Simulations

Liu,

Qi,

et al. 2024

ACS Omega

Self Cite

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In the background of the strong oil wettability and low production by water flooding in carbonate reservoirs, lowsalinity water containing sulfate ions can significantly change the surface wettability of carbonate rocks and thus increase the sweeping area; however, the absorption and desorption mechanisms of the oil film in the carbonate rock surface remain unclear. This paper analyzed the wettability alternation of carbonate rocks' surface in pure water and sodium sulfate solution. At the same time, MD (Materials Studio) software was used to simulate the formation process of the oil film and the effect of sulfate ions on the desorption of the oil film on the surface of carbonate rocks. The experimental results showed that sodium sulfate solution could accelerate the rate from oil-wet to water-wet and the final contact angle (49°) was smaller than that in pure water. The simulation results showed that dodecane molecules moved to the surface of calcite to form a double layer of the oil film and that the oil film near the calcite surface had a high-density stable structure under the van der Waals and electrostatic action. The hydrating sulfate ions above the oil film broke through the double oil film to form a water channel mainly under the action of electrostatic force and a hydrogen bond and then adsorbed on the calcite surface. A large number of water molecules moved down the water channel based on a strong hydrogen bonding force and crowded out the oil molecules on the surface of the calcite, resulting in the oil film detachment. This work aims to explain the interaction of oil molecules, water molecules, and SO 4 2− ions at the molecular scale and guide the practical application of low-salinity water flooding in carbonate reservoirs.

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Distribution, source investigation, and risk assessment of topsoil heavy metals in areas with intensive anthropogenic activities using the positive matrix factorization (PMF) model coupled with self-organizing map (SOM)

Cited by 37 publications

References 78 publications

Assessing the Natural Source Zone Depletion of a Petroleum-Contaminated Clayey Soil Site in Southern China Combining Concentration Gradient Method and Metagenomics

Assessing the Natural Source Zone Depletion of a Petroleum-Contaminated Clayey Soil Site in Southern China Combining Concentration Gradient Method and Metagenomics

Heavy Metal Pollution in the Environment and Its Impact on Health: Exploring Green Technology for Remediation

Effects of Sulfate Ions on Crude Oil Adsorption/Desorption on Carbonate Rocks: Experimental and Molecular Simulations

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