BRUNO TAPPIZ
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Artigo IPEN-doc 31212 Radon exhalation rate measurement in Amazon forest soil2024 - LAKIS, O.; MORALLES, M.; TOPPIZ, B.; OSTERMANN, C.K.; BUSTILHOS, J.O.V.; SILVA, P.S.C. daMeasurements of terrestrial residual gas emissions are important for investigations of atmospheric, biological, and geophysical processes. Terrestrial high-frequency flows of the radioactive noble gas 222 Rn are useful for evaluating the performance of regional atmospheric models through the use of validated radon flux maps. In this sense, this work aims to validate a laboratory method for determining soil parameters that can influence the flow of 222 Rn in samples collected at the Amazon Tall Tower Observatory (ATTO). Specifically, the pH and humidity values were determined for three soil types. Although more observations are still necessary, we concluded that, in comparison with works reported in the literature, the exhalation rate is in good agreement for tropical forest soils. However, no clear correlation could be observed between the 222 Rn exhalation rate and soil humidity or pH.Artigo IPEN-doc 28207 Determination of trace elements of fish from the lower portion of Pomba river by neutron activation2021 - LINHARES, H.M.S.M.D.; COSTA, I.D.; TAPPIZ, B.; MORAIS, M.C.; SILVA, P.S.C.Artigo IPEN-doc 28203 Determination of 238-U and 232-Th in soil samples collected near the Amazon Tall Tower Observatory, Brazilian Amazon2021 - TAPPIZ, B.; SILVA, P.S.C.; CARVALHO, E.F.; BOTIA, S.; LINHARES, H.M.S.M.D.; OSTERMANN, C.K.; BUSTILLOS, O.V.Artigo IPEN-doc 26156 Measurement uncertainty evaluation in fish samples analyzed by INAA and AAS2019 - TAPPIZ, BRUNO; MOREIRA, EDSON G.Measurement uncertainty was estimated following the EURACHEM guide (Quantifying Uncertainty in Analytical Measurement) for the elements As, Br, Cl, Co, Cr, Cs, Fe, K, Mg, Mn, Na, Rb, Sb, Se and Zn determined by Instrumental Neutron Activation Analysis (INAA) and for the elements Cd, Hg and Pb determined by Atomic Absorption Spectrometry (AAS) in the fillet of the most consumed fish species at São Paulo city, Brazil. INAA expanded uncertainties ranged from 1.0 to 21% and the main contributions were due the counting statistics of sample and pipetted standards. For AAS, expanded uncertainties ranged from 6.5 to 13% and the main contributions were associated to the calibration curves. Uncertainty results were compared with the standard deviations of the mass fraction in the fishes (n = 10). Due to the wide variability in the mass fraction in the analyzed fish tissues, explained by factors such gender, age, fat content and fishing location of the specimens of each specie, standard deviations were greater than expanded uncertainties, which means that the natural variability of the elements determined is greater than the data dispersion associateArtigo IPEN-doc 24041 Neutron activation analysis characterization procedures for fish consumed at São Paulo City2017 - TAPPIZ, BRUNO; MOREIRA, EDSON G.The characterization of edible tissues of fishes consumed by humans is very important for determination of several toxic and potentially toxic elements, ensuring the food safety. The Instrumental Neutron Activation Analysis (INAA) comparative method allows the determination of several of these elements, as well as others, for example of nutritional character. This study is part of the International Atomic Energy Agency (IAEA) technical cooperation project of Latin America and Caribbean countries to ensure the quality of food and biomonitoring of contaminants in molluscs and fishes. Ten specimens of 5 of the most consumed fish in São Paulo city: whitemouth croaker (Micropogonias Furnieri), smooth weakfish (Cynoscion learchus), common snook (Centropomus undecimalis), Brazilian sardine (Sardinella brasiliensis) and bluefish (Pomatomus Saltatrix) were analyzed. Complete procedures for analysis, which includes purchase in the largest warehouse in Latin America, transport to the laboratory, storage, freeze-drying, milling, weighting and others preparations of the subsamples, and the short irradiation parameters for the determination of Br, Cl, K, Mn and Na are reported. Results obtained for macro and microelements are presented and are in agreement with analysis of oyster tissue and mussel tissue certified reference materials under the same irradiation conditions, with z-score values ranging from -3.0 to 2.2.