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Use of reactive materials in the potentially toxic metals sorption and bioacessibility and toxicity assessment after retention

Grant number: 19/00275-6
Support type:Scholarships abroad - Research Internship - Doctorate
Effective date (Start): May 15, 2019
Effective date (End): November 14, 2019
Field of knowledge:Engineering - Sanitary Engineering - Environmental Sanitation
Principal Investigator:Valéria Guimarães Silvestre Rodrigues
Grantee:Jacqueline Zanin Lima
Supervisor abroad: Eduardo Anselmo Ferreira da Silva
Home Institution: Escola de Engenharia de São Carlos (EESC). Universidade de São Paulo (USP). São Carlos , SP, Brazil
Local de pesquisa : Universidade de Aveiro (UA), Portugal  
Associated to the scholarship:17/16961-0 - Use of organic compost and peat in the retention of Pb, Zn and Cd and evaluation of the possible availability, toxicity and bioaccessibility of these metals after retention, BP.DR

Abstract

Mining can drastically modify the potentially toxic metals natural geochemical cycle, leading to intense contamination by such elements. Therefore, an alternative is the use of so-called reactive materials, which stand out for their recognized metallic contaminants capacity retention. They can be used both in the construction of sealant and roofing barriers, as well as in amendments in soils contaminated by mining waste. In this perspective, the characterization and the study of the sorption capacity of metals (lead - Pb, zinc - Zn and cadmium - Cd) by different types of reactive materials (peat, compound and biochar) are already being carried out in the Doctorate developed in Brazil, at the São Carlos School of Engineering (EESC) of the University of São Paulo (USP). However, once these materials have already retained the contaminating metals, it is essential to know their remobilization potential and consequent influence on biota and human health. This information is essential to understand the future impacts that these elements may have on the environment and should be considered even before the materials are applied under natural conditions. In this perspective, the Research Internship Abroad (BEPE), in the Department of Geosciences of the University of Aveiro (Portugal), under the supervision of Prof. Dr. Eduardo Anselmo Ferreira da Silva, will initially allow the tests execution to determine the ability of arsenic (As) immobilization by these reactive materials, as an extremely toxic element As should also be analyzed because its frequently association with mining waste, but which is not routine in the atomic absorption equipment that has been used in Brazil. Studies are therefore planned to involve the future impact of reactive media after sorption, associated with human health and biota (through bioaccessibility and toxicity tests, respectively, allowing ecological risk assessment). Thus, a multidisciplinary analysis complements the analysis of the construction materials to the final contact with the biota and the environment as a whole, after the contaminating metals immobilization.