JACINETE LIMA DOS SANTOS
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Artigo IPEN-doc 30267 Aspects of higly microplastic contamination in the Atlantic Forest estuary2023 - PARRA, DUCLERC F.; GIMILIANI, GIOVANA; SANTOS, JACINETE L. dos; COTRIM, MARYCEL E.B.The Atlantic Forest is one of the richest regions in terms of biodiversity in the world. Originally the biome covered about 15% of the national territory. Currently, only about 12.4% (SOS MATA ATLÂNTICA, 2021) of well-preserved forest remnants remain in the country [1]. Regarding mangrove areas, in the state of São Paulo there are about 223 km², according to the Atlas of mangroves in Brazil, with about 120.5 km² of this total in Baixada Santista. Analyzes of sediments collected at Santos estuarine mangroves, in various points show a high concentration of microplastics generated from industrial processes or even anthropogenic activity. These solid particles based on (< 5 mm) are today one of the main environmental problems. The microplastics present in the sediment samples were quantified after drying and sieving amount limited of sediment. FTIR and micro-Raman spectroscopy identified filaments and fragments of microplastics (MPs) as commom polymer spectra. Also additives and herbicides were present in some MPs. All polymeric types identified (<5mm) have wide applications and demands by packaging, civil construction, automotive, electrical and electronics, and textile sectors.Artigo IPEN-doc 27924 Study of new routes for purification of fission 99Mo2021 - DAMASCENO, M.O.; MARQUES, F.A. da S.; DIAS, R.R.; SANTOS, J.L.; FORBICINI, C.A.L.G.O.99mTc is the most used medical radioisotope in the world, especially for diagnosis procedures. It is originated in the radioactive decay of 99Mo, which in turn is one of the fission products of the uranium irradiation that occurs in nuclear reactors. The chemical processing of 99Mo might be lined up in several steps according to the characteristics of the targets or the local requirements in order to separate it from other fission products. In this work, two routes of 99Mo purification, MR1 and MR2, were purposed as an alternative method to be set up in the Brazilian Multipurpose Reactor project. The MR1 route consisted by three consecutives chromatographic columns packed with strong anionic resin, Chelating resin, and aluminum oxide, respectively. The MR2 route was arranged in two chromatographic columns and a sublimation oven. The final yield for the MR1 was 84.4% and the overall time process was about 7 hours, performing the highest final 99Mo recovery efficiency, high decontamination degree and a shorter process time compared to the MR2.