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Frontiers of Agricultural Science and Engineering

ISSN 2095-7505

ISSN 2095-977X(Online)

CN 10-1204/S

Postal Subscription Code 80-906

Front. Agr. Sci. Eng.
Advancement of metal(loid) research on farmland
Qiang ZHENG1, Chenchen WEI2, Yanbing CHI3, Peiling YANG1()
1. College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
2. Agricultural Water Conservancy Department, Changjiang River Scientific Research Institute, Wuhan 430019, China
3. Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China
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Abstract

● It is crucial to comprehensively summarize remediation technologies and identify future development directions.

● This review systematically summarizes various soil remediation and improvement technologies, incorporating multiple disciplines including physics, chemistry and biology, as well as their interdisciplinary intersections.

● A solid foundation is given for the healthy development of soil.

Metal(loid) pollution has emerged as a pressing environmental issue in agriculture, garnering extensive public attention. Metal(loid)s are potentially toxic substances that infiltrate the soil through diverse pathways, leading to food chain contamination via plant uptake and subsequent animal exposure. This poses a serious threat to environmental quality, food security, and human health. Hence, the remediation of metal(loid)-contaminated agricultural soil is an urgent concern demanding immediate attention. Presently, the majority of research papers concentrate on established, isolated remediation technologies, often overlooking comprehensive field management approaches. It is imperative to provide a comprehensive summary of remediation technologies and identify future development directions. This review aims to comprehensively summarize a range of soil remediation and enhancement technologies, incorporating insights from multiple disciplines including physics, chemistry, biology, and their interdisciplinary intersections. The review examines the mechanisms of action, suitable scenarios, advantages, disadvantages, and benefits associated with each remediation technology. Particularly relevant is the examination of metal(loid) sources, as well as the mechanisms behind both established and innovative, efficient remediation and enhancement technologies. Additionally, the future evolution of remediation technologies are considered with the aim of offering a scientific research foundation and inspiration to fellow researchers. This is intended to facilitate the advancement of remediation technologies and establish a robust foundation for sustainable development of soil.

Keywords Metal(loid) pollution      metal(loid) remediation      metal(loid) sources      soil     
Corresponding Author(s): Peiling YANG   
About author:

Li Liu and Yanqing Liu contributed equally to this work.

Just Accepted Date: 27 March 2024   Online First Date: 15 April 2024   
 Cite this article:   
Qiang ZHENG,Chenchen WEI,Yanbing CHI, et al. Advancement of metal(loid) research on farmland[J]. Front. Agr. Sci. Eng. , 15 April 2024. [Epub ahead of print] doi: 10.15302/J-FASE-2024554.
 URL:  
https://academic.hep.com.cn/fase/EN/10.15302/J-FASE-2024554
https://academic.hep.com.cn/fase/EN/Y/V/I/0
Fig.1  Sources of metal(loid).
Fig.2  Average soil metal(loid) concentration (mg·kg–1).Statistical data of metal(loid) content in farmland soils in China were searched using keywords for metal(loid) in the specific city and county. For the same region, the most literature was used. Excluding research on metal(loid) in non farmland soils such as urban industrial land, atmospheric dust, and marine sediments, a total of 603 publications since 2002 were selected, including the measured data of metal(loid) in 614 typical farmland sample points. Due to the limited literature, the statistical area does not include the Hong Kong, Macao, Taiwan, and Nanhai Zhudao (South China Sea Islands).
Technique Classification Application Advantages Disadvantage
Physical remediation Guest soil mulchingSurface strippingDeep plowingDilutionSoil replacementIsolationHeat treatmentDrenching Lightly contaminated soilsHeavily contaminated areas ThoroughnessStability High investment costsMay damage the soil structureCause soil fertility declineChange out of the dirty soil to pile or disposal
Chemical remediation Curing/stabilizationVitrificationSoil drenchingElectroremediation Lightly contaminated soilsHeavily contaminated areas Reducing metal (loid) migrationChanging the properties of metal(loid) High investment costsDoes not removeMetal(loid) completely from the soil
Microbial remediation Adsorption by microbialPrecipitation by microbialLeaching by microbialTransformation by microbialVolatilization by microbial Lightly contaminated soilsHeavily contaminated areas Low-cost Environmently-friendly Economic benefits Ecological sustainability Greatly influenced by environmental factors, pollutant properties and concentrations, local climatic conditions, site hydrogeological conditionsCause greater potential harmApplication is still difficult
Phytoremediation PhytoextractionPhytofiltrationPhytostabilizationPhytovolatilizationphytodegradation Lightly contaminated soilsHeavily contaminated areas Green and environmentally-friendly EfficiencyCommunity balance
Tab.1  Established metal(loid) remediation technology
Fig.3  Historic research on soil metal(loid) pollution and its remediation.
Fig.4  Typical agricultural management measures.
Joint remediation technique Remediation mechanism Advantage
Biochar and phytoremediation Biochar has the potential to combine with phytoremediation technology due to its strong adsorption and wealthy functional groups, which can promote the growth, enhance the fixation of metal(loid) and promote their uptake Greener and more efficient
Microbial and phytoremediation Improve the efficiency of microbial remediation of soil metal(loid) pollution, promote plant extracellular ligand reactions of metal(loid) ions, promote soil metal(loid) enrichment, promote release metabolites by plant Good remediation and maintenance of the ecological environment
Microbial, phytoremediation, and nanomaterials Promote plant absorption efficiency and tolerance through a combination of chemical and biological processes, resulting in efficient treatment Economically efficient
Microorganisms and biochar Use biochar to make the soil loose and provide more living space for microorganisms, reduce the toxic effects of metal(loid), reduce metal(loid) uptake by seedlings, and increase the structural richness and species diversity of inter-root soil bacterial and fungal communities Green and highly efficient
Water, fertilization, and other measures By adjusting soil water, fertilizer, gas (steam), heat, pH, and reduction potential of plant roots, the effective use of water and fertilizer resources by roots can be promoted, and the absorption of metal(loid) pollutants by roots and the transfer Economically efficient and convenient
Nanomaterials and electrokinetic Nanomaterials can adsorb soil metal(loid) ions and enhance the transport potential of nanomaterials through electrophoresis, Environmentally-friendly
Nanomaterials and phytoremediation Nanomaterials can improve the ability of plants to absorb metal(loid) by reducing their toxicity to plants Green and highly efficient
Tab.2  Joint remediation techniques
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