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Sustainability
Special Issues
Environmental Fate, Transport and Remediation of Metal and Organic Contamination
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Environmental Fate, Transport and Remediation of Metal and Organic Contamination

A special issue of Sustainability (ISSN 2071-1050). This special issue belongs to the section "Pollution Prevention, Mitigation and Sustainability".

Deadline for manuscript submissions: closed (20 April 2024) | Viewed by 1234

Special Issue Editors

Dr. Md. Samrat Alam

E-Mail Website
Guest Editor
Geological Survey of Canada, GSC-Quebec, Natural Resources Canada, 490 rue de la Couronne, Québec, QC G1K 9A9, Canada
Interests: aqueous geochemistry; biogeochemistry; organic geochemistry; isotope geochemistry
Special Issues, Collections and Topics in MDPI journals
Dr. Md. Golam Kibria

E-Mail Website
Guest Editor
Department of Physics, Earth Science and Space Systems Engineering, Morehead State University, 425-E Lappin Hall, Morehead, KY 40351, USA
Interests: soil geochemistry and aqueous chemistry; agriculture impact on watershed; nanopore characterization and fluid flow behavior of porous media

Special Issue Information

Dear Colleagues,

Metal and organic compound contamination is a persistent problem at many sites worldwide. The fast pace of industrialization and the high demand for energy are the key factors that aggravate the problem of environmental pollution. The presence of metals and organic compounds in groundwater and soils can pose a significant threat to human health and ecological systems. The fate and transport of contaminants in subsurface environments can be quite complex because of various physical, chemical, and biological processes as well as the chemical form and speciation of the metal. To understand the risk and develop remedial strategies, a rigorous understanding of geochemistry that influences the distribution, speciation, and transport is needed. Though advances have been made toward understanding the fate, transport, and remediation of metals and organic compounds in the subsurface, fundamental synergistic mechanisms need to be further explored to develop effective, inexpensive, green, and sustainable remediation technologies. Sustainable development of green technologies and cleanup strategies can also help to increase environmental protection. In this Special Issue, we welcome a broad range of manuscripts that encompass emerging techniques, technologies, and strategies dealing with various aspects of assessing and remediating contaminants in soils and groundwater.

Dr. Md. Samrat Alam
Dr. Md. Golam Kibria
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Sustainability is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • metals
  • organic pollutants
  • contamination
  • fate and transport of contaminants
  • remediation

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Published Papers (1 paper)

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Research

16 pages, 3143 KiB  
Article
Effects of Silicon Application on Nitrogen Migration in Soil–Rice Systems under Cadmium Stress
by Xiao Tan, Jingjing Gao, Longguo Li and Jin Yu
Sustainability 2023, 15(24), 16552; https://doi.org/10.3390/su152416552 - 5 Dec 2023
Viewed by 821
Abstract
Cadmium (Cd) contamination is a serious threat to plants and humans, which subsequently impairs sustainable agricultural production and ecosystem service. Silicon (Si) has been applied to mitigate Cd toxicity, but inevitably has direct and indirect impacts on nitrogen (N) behaviors in soil and [...] Read more.
Cadmium (Cd) contamination is a serious threat to plants and humans, which subsequently impairs sustainable agricultural production and ecosystem service. Silicon (Si) has been applied to mitigate Cd toxicity, but inevitably has direct and indirect impacts on nitrogen (N) behaviors in soil and plants. However, what role plants play in the N response to Si in soil–rice systems under Cd stress is not known. Therefore, the effects of Si on N migration through different pathways in the soil-rice system were systematically investigated in a rice-cultivation lysimeter experiment. The rice was planted in Cd-contaminated (5 mg kg−1) and uncontaminated soils with three levels of Si application (0, 100, and 200 kg SiO2 hm−2), and the contents of N and Cd in different forms in plants and soils were measured. The group without Cd and Si was set as CK. The study reported that Cd stress caused Cd accumulation in plants, inducing a decrease of 26.0~83.4% in plant dry weights and a decrease of 15.7~46.6% in N concentration compared with CK. Moreover, the leaching of N in soils was increased by Cd, in which the NO3−-N rather than the NH4+-N was leached out. These adverse effects on the plant growth and soil N loss were significantly alleviated by Si application in two ways: (1) the Cd availability in soils was reduced with the acid-extractable Cd (the Cd form with high mobility), decreasing from 1.07 to ~0 mg kg−1; (2) the Cd uptake and translocation in plants were restricted, with the Cd content decreasing by 59.1~96.4% and the translocation index decreasing from 17.7% to 2.2%. The combination of the two mechanisms consequently increased the N absorption of plants from 1.35 to 2.75~3.5 g. The results of the N mass balance calculation showed that, compared with soil N flux, plant-absorbed N contributed predominantly (43.9~55.6%) to the soil total N variation. Moreover, there is a significant trade-off between plant-absorbed N and soil N flux. The magnitude and direction of the soil N flux were greatly and negatively affected by plant-absorbed N during the flooding period. Hence, we conclude that Si application could reduce the leaching of N in soil–rice systems under Cd stress, mainly due to the promotion of the N absorption of plants rather than N immobilization in soils. This study provided new evidence that plants played a dominant role in N response to Si in soil-rice systems under Cd stress. Full article
(This article belongs to the Special Issue Environmental Fate, Transport and Remediation of Metal and Organic Contamination)
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