ELIZABETH SONODA KEIKO DANTAS
ScopusID Resumo
Possui mestrado em Química pelo Instituto de Pesquisas Energéticas e Nucleares (1990) e doutorado em Química (Química Analítica) [Sp-Capital] pela Universidade de São Paulo (1999). Atualmente é pesquisador adjunto do Instituto de Pesquisas Energéticas e Nucleares. Tem experiência na área de Química, com ênfase em Análise de Traços e Química Ambiental, atuando principalmente nos seguintes temas: absorção atômica, cromatografia de íons, metais, especiação. (Texto extraído do Currículo Lattes em 04 maio 2023)
Lattes Projetos de Pesquisa
Unidades Organizacionais
Cargo
11 resultados
Resultados de Busca
Agora exibindo 1 - 10 de 11
Artigo IPEN-doc 25789 Mercury exposure among dental staff in the legal Amazon2019 - VILLIBOR, FERNANDA F.; GUILHEN, SABINE N.; DANTAS, ELIZABETH S.K.; PIRES, MARIA A.F.Elemental mercury is highly toxic and may be absorbed by dental professionals through direct skin contact or inhalation. The use of mercury in dental amalgam has been a concern of the academic community for years, for its incorporation is likely to affect vital organ systems. Several studies have been conducted to address the possible risks of occupational exposure to mercury vapor in dental offices. The present study aimed to present evidences that mercury is assimilated by exposed workers through the determination of urinary mercury (HgU) from dental professionals (n = 91) of public offices in Araguaína (Tocantins, Brazil). This uptake was verified against samples from unexposed individuals (n = 43), which activities are not dentistry related. Cold vapor atomic absorption spectrometry (CV-AAS) technique enabled the subjects’ biological monitoring. Approximately 44.8% (n = 60) of the 134 participants were aged between 21 and 30 years and were at the beginning of their professional lives; 9.7% (13) of the study participants were men and 90.3% (121) were women. Hg concentrations in all samples analyzed were within the maximum biological limit set by the World Health Organization (WHO) (<50 μgHg·L−1). HgU concentrations in dental professionals were within the limits proposed by the Brazilian regulatory standard, Regulatory Norm-7 (RN-7) (≤35 μgHg·g−1 creatinine). Nevertheless, the average concentration of HgU was approximately 8 times higher in the potentially exposed group (5.61 μgHg·g−1 creatinine) than in the unexposed group (0.65 μgHg·g−1 creatinine), highlighting the potential risk of occupational exposure to mercury.Artigo IPEN-doc 20088 Enrichment diagram (ED)2014 - RIBEIRO, ANDREZA P.; FIGUEIREDO, ANA M.G.; SANTOS, JOSE O. dos; DANTAS, ELIZABETH S.K.; COTRIM, MARYCEL E.B.; FERREIRA, PAULO A. de L.; FRANÇA, ELVIS J. de; GRAUDENZ, GUSTAVO S.; MAHIQUES, MICHEL M. de; FIGUEIRA, RUBENS C.L.; WASSERMAN, JULIO C. de F.A.Purpose – The purpose of this paper is to validate and apply enrichment diagrams (EDs) to determine metal and as enrichment and contamination in the sediments of Sepetiba Bay. Design/methodology/approach – Through inducted coupled plasma – optical emission spectrophotometry, total element (As, Cd, Cu, Ni, Pb and Zn) concentrations were assessed for the construction of EDs and comparison with enrichment factors (EFs) in 65 samples collected in Sepetiba Bay. Findings – Based on the EDs, it was observed that the sediments around the urban area of Sepetiba and Itaguaı´Harbor were contaminated with Cd, Cu, Ni, Pb and Zn. These contaminants were expected due to the urban and industrial discharges into the bay and the activities at Itaguaı´Harbor. Originality/value – The ED was successful regarding its ability to evaluate inorganic contamination in Sepetiba Bay. In addition, this method was able to define a proper background sample for calculating EFs.Artigo IPEN-doc 04805 Concentrations of some ionic species in rainfall from Sao Paulo1993 - PIRES, M.A.F.; DANTAS, E.S.K.; SEPULVEDA MUNITA, C.J.A.; PAIVA, R.P.Artigo IPEN-doc 05667 Determination of chemical species in drinking water by ion chromatography1994 - PIRES, M.A.F.; DANTAS, E.S.K.; SEPULVEDA MUNITA, C.J.A.Artigo IPEN-doc 06059 An attempt to identify commercial drinking water through means of some ionic species1995 - PIRES, M.A.F.; DANTAS, E.S.K.; SEPULVEDA MUNITA, C.J.A.Artigo IPEN-doc 02925 Fluoride content of some teas consumed in Sao Paulo1996 - PIRES, M.A.F.; DANTAS, E.S.K.; SEPULVEDA MUNITA, C.J.A.Artigo IPEN-doc 09073 Evaluation of the rainwater acidity of a rural region due to a coal-fired power plant in Brazil2002 - FLUES, M.S.M.; HAMA, P.; LEMES, M.J.L.; DANTAS, E.S.K.; FORNARO, A.Artigo IPEN-doc 09386 Characterization of corrosion products from Nd-Fe-B magnets used in dental prostheses2002 - SAIKI, M.; ROGERO, S.O.; COSTA, I.; DANTAS, E.S.K.; OLIVEIRA, M.C.L.This work presents results obtained in the elemental analysis of Nd-Fe-B magnets and their corrosion products. The corrosion products were analyzed in the extracts of culture medium where the magnets had been immersed for 10 days at 37°C. Elements B, Co, Fe, La, Nd, Dy, Pr, Sm, Ho, Yb and Lu were found in the magnet and the analysis of extract indicated that Co, Fe and Nd are released from the magnet to the extract. Toxicity was also investigated in this extract using the neutral red uptake cytotoxicity assay.Artigo IPEN-doc 09560 Corrosion performance and cytotoxicity of sintered Nd-Fe-B magnets2003 - ROGERO, S.O.; SAIKI, M.; DANTAS, E.S.K.; OLIVEIRA, M.C.L.; CRUZ, A.S.; IKEDA, T.I.; COSTA, I.Artigo IPEN-doc 16080 Validacao de metodologia analitica para determinacao de mercurio total em amostras de urina por espectrometria de absorcao atomica com geracao de vapor frio (CV-AAS). Estudo de caso2010 - GUILHEN, SABINE N.; PIRES, MARIA A.F.; DANTAS, ELIZABETH S.K.; XAVIER, FERNANDA V.