Assessment of the mobility, bioaccessibility, and ecological risk of Pb and Zn on a dirt road located in a former mining areaRibeira ValleyBrazil

Autor(es)

Kasemodel, Mariana Consiglio ^[1] ; Ruiz Papa, Thiago Bueno ^[2] ; Sigolo, Joel Barbujiani ^[3] ; Silvestre Rodrigues, Valeria Guimaraes ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sao Carlos Sch Engn, Dept Geotech Engn, 400 Trabalhador Saocarlense Ave, BR-13566590 Sao Carlos, SP - Brazil

^[2] Forens Expertise Team Avare SPTC, 11 Mato Grosso Rd, BR-18705390 Avare, SP - Brazil

^[3] Univ Sao Paulo, Inst Geosci, 562 Lago Rd, BR-05508080 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ENVIRONMENTAL MONITORING AND ASSESSMENT; v. 191, n. 2 FEB 2019.
• Citações Web of Science: 2

Resumo

The inadequate transportation of foundry slags during the construction of a mining waste landfill accounted for the presence of slags in the dirt road that connects the working district of Vila Mota to the city of Adrianopolis. The objectives of this work were to assess the lead (Pb) and zinc (Zn) contamination of the dirt. Three samples separated by 2km were collected along a dirt road (samples: Adrianopolis, Deposit, and Plant). The conducted assays were physico-chemical parameters, pseudototal concentration, three sequential extraction procedures, and bioaccessibility assay. The laboratory data was used as input in the calculation of contamination indices risk assessment code (RAC) and potential ecological risk (Er-i). The dirt road presented high concentrations of Pb (mean 1426.5mgkg(-1)) and Zn (mean 4964.8mgkg(-1)). The BCR SEP (Bureau Community of Reference Sequential Extraction Procedure) method was more adequate in extracting the soluble-exchangeable fraction, and this fraction was correlated with the gastric phase. The bioaccessible fraction is mainly present in the stomach fraction and is transported to the intestinal phase. Using BCR SEP method to calculate the contamination indices, sample Deposit yielded very high risk when calculating RAC and Er-i for Pb (72.9% and 639.5, respectively). For Zn, high risk was obtained with RAC and very high risk for Er-i (42.5% and 344.2, respectively). The high content of Pb and Zn on the dirt road presents a risk to the population that uses this road, since the soil particles are easily transported, deposited on the dermis, and inhaled. (AU)

• Processo FAPESP: 14/07180-7 - Estudo do grau de contaminação do solo devido a disposição de resíduos de mineração na área da antiga usina Plumbum (Adrianópolis, PR)
• Beneficiário: Valéria Guimarães Silvestre Rodrigues
• Modalidade de apoio: Auxílio à Pesquisa - Regular