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Systematic review of alternative materials that improve retention of potentially toxic metals in soil/clay liners in waste disposal areas

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Abstract

When soils available for the construction of liners do not display the characteristics necessary for a good performance, mixtures with other materials can be employed for achieving the desired quality. Several researchers have addressed those mixtures from either a geotechnical or a gas diffusion perspective, emphasizing low hydraulic conductivity. However, in recent years, growing attention has been drawn to the ability of liners to mitigate contamination. The literature lacks studies on the use of amendments for soil liners or cover systems to retain potentially toxic metals, which are important inorganic contaminants. This paper provides a systematic review of the literature considering publications available on Web of Science and SpringerLink databases between January 1st, 2012, and December 5th, 2022. The aim of the review was to identify the types of soils and amendments studied as liners or cover systems for such retention of potentially toxic metals, the methodologies of application of the alternative materials in the soils, and the research gaps and perspectives in the field. Seventeen papers that addressed 31 materials as amendments were retrieved. The most studied amendment was coal fly ash, and 17 amendments were residues or by-products, which indicates concerns over waste destination and sustainability. Among the potentially toxic metals analyzed are Pb, Cu, and Cd. Gaps such as lack of pilot, field-scale, and long-term studies, as well as perspectives for future research (e.g., different liner configurations, concomitant mixtures of two or more materials in the soil, and focus on the sustainability of amendments), were identified.

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The datasets created during and/or analyzed during the present study will be made available by the corresponding author upon reasonable request.

Funding

The authors acknowledge National Council for Scientific and Technological Development (CNPq) for the Ph.D. scholarship (Process 140024/2019-5) and Research Productivity Fellowship (310989/2020-5).

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Jéssica Pelinsom Marques: conceptualization, methodology, formal analysis, investigation, writing original draft, review and editing. Isabela Monici Raimondi Nauerth: methodology, formal analysis, investigation, writing original draft, review and editing. Mariana Consiglio Kasemodel: conceptualization, review and editing, resources and supervision. Valéria Guimarães Silvestre Rodrigues: conceptualization, methodology, review and editing, resources and supervision

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Correspondence to Jéssica Pelinsom Marques or Valéria Guimarães Silvestre Rodrigues.

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Not applicable as the study did not include human subjects.

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The authors declare no competing interests.

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Marques, J.P., Nauerth, I.M.R., Kasemodel, M.C. et al. Systematic review of alternative materials that improve retention of potentially toxic metals in soil/clay liners in waste disposal areas. Environ Monit Assess 196, 394 (2024). https://doi.org/10.1007/s10661-024-12546-w

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