Radionuclide, Metal and Non-metal Levels in Percolated Water from Soils Fertilized with Phosphogypsum |
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Authors: | Eliana Aparecida Nonato Knupp Camilla Gonçalves Bof Silva Kerley Alberto Pereira de Oliveira Flávia Regina de Amorim Maria Célia Siqueira Maria Helena Tirollo Taddei Milton Batista Franco Helena Eugênia Leonhardt Palmieri Vanusa Maria Feliciano Jacomino |
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Affiliation: | 1. Nuclear Technology Development Center/Brazilian Nuclear Energy Commission (CDTN/CNEN), Av. Prof. Ant?nio Carlos, 6627, Belo Horizonte, MG, CEP 30270-901, Brazil 2. Departament of Sanitary and Environmental Engineering, Federal University of Minas Gerais, Av. Prof. Ant?nio Carlos, 6627, Belo Horizonte, MG, CEP 31270-901, Brazil 3. Po?os de Caldas Laboratory/Brazilian Nuclear Energy Commission (LAPOC/CNEN), Rodovia Po?os de Caldas, km 13—Andradas, CEP 37701-970, Po?os de Caldas, MG, Brazil
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Abstract: | Phosphogypsum (PG) is a by-product of the phosphate fertilizer industry, which is produced by precipitation during the wet process of phosphate rocks. While commercial uses, in agriculture and in manufacturing gypsum board and Portland cement, consume less than a few percent of this by-product, the vast majority is disposed of on land in gypsum. In Brazil, three main industries are responsible for the production and storage of about 5.5 × 106 tons per year. PG may contain trace metals, non-metals, fluorides and natural radionuclides. Since, in Brazil, PG has been used for many years as soil amendment, it is important to know its availability, mainly in aquatic environments used for human consumption. In this case, more restrictive limits must be adopted. This work aimed to evaluate the mobility of metals in sand and clayey soils and, consequently, the contamination of drainage water through greenhouse-scale leaching and transport of toxic elements and radionuclides from soils fertilized with PG to crops. In general, it was observed that elemental concentrations were below the actual detection limit of the equipment for all conditions of interest, indicating a low mobility of the analyzed elements in the soil. |
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