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Galvanic waste use as secondary materials of interest agronomic: solubilization reactions and environmental risk evaluation

Grant number: 13/09732-4
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): September 01, 2013
Effective date (End): August 02, 2015
Field of knowledge:Agronomical Sciences - Agronomy
Principal researcher:Marcos Yassuo Kamogawa
Grantee:Cleiton dos Santos Mattos
Home Institution: Escola Superior de Agricultura Luiz de Queiroz (ESALQ). Universidade de São Paulo (USP). Piracicaba , SP, Brazil

Abstract

The residues originated from electrodeposition industry present potentially toxic metals, such as barium, cadmium, lead and chromium. The improper disposal generates environmental and human life hazards. On the other hand, they also contain high quantities of nutrients, such as copper, zinc and nickel, that show agronomical relevance. These residues, known as secondary materials, have been studied by productive sectors, public ministry and research institutions. Previous work demonstrated the feasibility of employing these residues as sources of agronomical micronutrients. However, they did not perform studies to identify the chemical reactions involved in solubilization, adsorption and precipitation of the many materials in the soil-soil solution-plant interface. In this way, this project aims at evaluating the viability of employing galvanic residues (gold and silver coatings) from jewelery industry as sources of copper and nickel and, mainly, at determining the reactions involved on the transference from soil to plants. The scientific investigations will be based on aqueous solution extractions and chemical reactions in the presence of soil and plants. Adsorption, precipitation, ion-exchange, microbiologic activity and mobility reactions will also be evaluated. The analytical procedures will be based on spectrochemical detection such as FAAS, GFAAS and ICP-OES and they will be applied on metal ions fractionation, aiming at the determination of soluble, exchangeable and original fractions, as well as variations on solubility due to microbiological activity, rizhosphere exudates and the presence of fertilizers. The sequence of the proposed experiments will furnish the fundaments for the identification of the main solubilization reactions and the availability to plants. This will also contribute for the development of proper analytical procedures for the accurate prediction of nutrient availability in secondary materials and to evaluate intrinsic environmental hazards. (AU)

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