Research progress and hotspots on microbial remediation of heavy metal-contaminated soil: a systematic review and future perspectives

Li, Xianhong; Gao, Yang; Ning, Xiaolin; Li, Zhonghong

doi:10.1007/s11356-023-30655-w

Cited by 6 publications

(2 citation statements)

References 79 publications

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“…The procedure involves thorough pre-sampling planning, standardized sampling protocols, rigorous field quality control measures, careful sample handling and transport, meticulous laboratory analysis, comprehensive data validation and quality assurance checks, and detailed reporting. By adhering to these steps, researchers can minimize errors, ensure data integrity, and provide accurate insights into the spatial variability of heavy metal concentrations in soil 36 .…”

Section: Methodsmentioning

confidence: 99%

Spatial variability of heavy metals concentrations in soil of auto-mechanic workshop clusters in Nsukka, Nigeria

Duru,

Echiegu,

Anyadike

et al. 2024

Sci Rep

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The indiscriminate disposal of spent engine oils and other hazardous waste at auto mechanic workshops clusters in Nsukka, Enugu State, Nigeria is an environmental concern. This study examines the concentration of heavy metals in the soil inside the workshop cluster and in the unpolluted soil outside the workshop cluster at approximately 100 m. Ten sampling points were randomly selected from within the cluster and another ten from outside the cluster. Using a hand-held Global Positioning System, the coordinates of the selected points were established and used to create a digital map. Soil samples at depths of 0–30 cm and 30–60 cm, were analyzed for Cu, Fe, Zn, Pb, As and Cd using Spectrophotometer. Moisture content determination and particle size analysis were also done on the samples. Spatial variability of heavy metals concentrations of the studied site was also mapped with ArcGIS 10.2.2 using interpolation methods. Results showed that the soil ranged from sandy loam to sandy clay loam. Cadmium and Zinc had the lowest and highest concentration, respectively, in the studied area. Comparing the concentrations of heavy metals in soils within and outside the auto mechanic cluster revealed notable differences across various depths (0–30 cm and 30–60 cm). The analysis results for soil samples within the cluster exhibited concentration levels (mg/kg) ranging from 0.716–0.751 (Cu), 2.981–3.327 (Fe), 23.464–30.113 (Zn), 1.115–1.21 (Pb), 2.6–2.912 (As), and 0.133–0.365 (Cd) demonstrating a variation pattern in the order of Zn > Fe > As > Pb > Cu > Cd. Conversely, for soil samples outside the cluster, concentration levels (mg/kg) ranged from 0.611–0.618 (Cu), 2.233–2.516 (Fe), 12.841–15.736 (Zn), 0.887–0.903 (Pb), 1.669–1.911 (As), and 0.091–0.091 (Cd). To assess the disparity in heavy metal concentration levels between samples collected within and outside the clusters, ANOVA test was performed. The test showed significant difference in heavy metal concentrations between samples within and outside the auto mechanic cluster (p < 0.05), implying auto mechanic activities significantly impact heavy metal levels within the cluster compared to outside areas. The assessment of soil pollution utilized indices including the Geo-accumulation Index (Igeo), Contamination factor (Cf), and anthropogenic metal concentration (QoC). Zinc, Cadmium, and Arsenic showed the highest contamination factors, indicating significant soil contamination likely due to anthropogenic activities. The concentrations of the metals analyzed were within WHO permissible limits while the metals concentrations were also observed to decrease as depth was increased. Using ArcGIS 10.2.2, spatial maps showing heavy metal distribution were developed, with the Kriging method proving superior. This study suggests that heavy metal levels in the soil at the area be monitored on a regular basis.

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Section: Methodsmentioning

confidence: 99%

Spatial variability of heavy metals concentrations in soil of auto-mechanic workshop clusters in Nsukka, Nigeria

Duru,

Echiegu,

Anyadike

et al. 2024

Sci Rep

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show abstract

“…Additionally, root exudates such as organic acids could modify the forms of heavy metals to activate or stabilize heavy metal compounds. Microbial remediation operates through functional groups (such as hydroxyl and carbonyl groups) present on the surfaces of the microorganisms, which interact with heavy metal ions via ion exchange, complexation, chelation, or electrostatic adsorption [88]. Microorganisms could also secrete organic acids that dissolve or form complexes with heavy metals, produce basic compounds leading to precipitation reactions with heavy metal, and produce various enzymes capable of redox reactions (e.g., oxidizing As 3+ into As 5+ or reducing Cr 6+ into Cr 3+ ) [89].…”

Section: Heavy Metal Remediation Of Intertidal Sedimentsmentioning

confidence: 99%

Migration and Transformation of Heavy Metal and Its Fate in Intertidal Sediments: A Review

Geng,

Xia,

et al. 2024

Processes

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Intertidal sediments are rich in biological resources, which are important for material circulation and energy exchange. Meanwhile, these areas can be treated as sinks as well as sources of coastal heavy metal pollutants. Due to the influence of the tide, the intertidal sediments are in a state of periodic flooding and exposure, and environmental factors such as dissolved oxygen, salinity and overlying water pressure are changeable. Heavy metals in sediments are prone to migration and transformation with the dynamic effects of tidal water and the changes in the environment factors, which increase the bioavailability of heavy metals. In this review, the characteristics of distribution and the bioavailability of heavy metals in intertidal sediments are described; the migration and transformation behavior of heavy metals and its influencing factors under tidal conditions are analyzed; and the mechanisms of heavy metal’s migration and transformation in the intertidal zone are summarized. Moreover, the bioaccumulation of heavy metal by organisms and the remediation techniques are discussed. Therefore, this review systematically summarizes the states of existence, the transport mechanisms, and the fate of heavy metals in the intertidal sediment, fills in the research gap of the cycling of heavy metal in the intertidal zone, and provides a theoretical basis for the control of heavy metal pollution.

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Bibliometric analysis and systematic review on the electrokinetic remediation of contaminated soil and sediment

Li,

2024

Environ Geochem Health

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Research progress and hotspots on microbial remediation of heavy metal-contaminated soil: a systematic review and future perspectives

Cited by 6 publications

References 79 publications

Spatial variability of heavy metals concentrations in soil of auto-mechanic workshop clusters in Nsukka, Nigeria

Spatial variability of heavy metals concentrations in soil of auto-mechanic workshop clusters in Nsukka, Nigeria

Migration and Transformation of Heavy Metal and Its Fate in Intertidal Sediments: A Review

Bibliometric analysis and systematic review on the electrokinetic remediation of contaminated soil and sediment

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