PAULO SERGIO C. SILVA
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Artigo IPEN-doc 26228 Radiological characterization of peloids maturated with Águas de Lindóia, Poços de Caldas and Peruíbe waters2019 - TORRECILHA, JEFFERSON K.; MARRICHI, JUSSARA M.O.; SOUZA, EDUARDO A.P.; GOUVEA, PAULO F. de M.; SILVA, PAULO S.C..One of the concerns about using mineral clay for therapy treatments is its radioactivity content due to natural radionuclides, normally, associated with the clays. This work proposes to characterize the natural radionuclides of the peloids obtained by the maturation process of mixing bentonite and montmorillonite with different mineral medicinal waters from Águas de Lindóia (SP), Peruíbe (SP) and Poços de Caldas (MG). For this procedure, gray end green bentonite samples were left in contact with running water for three, six and nine months, after this, they were collected, dried, transferred to a mortar, crushed and placed in approximately 40 cm3 polyethylene flasks, sealed and set apart for about four weeks, prior to the measurements. The concentration of 210Pb was determined by measuring the activity of its low energy peak (47 keV). Comparing the gray and green bentonite peloids, all the activity concentration of radionuclides are higher in gray ones, except 40K. The activity concentration varied from 84 to 156 Bq kg−1 (228Ra), 25 to 156 Bq kg−1 (228Th), 9 to 161 Bq kg−1 (226Ra), 39 to 256 Bq kg−1 (210Pb) and 162 to 1070 Bq kg−1 (40K).Artigo IPEN-doc 26159 Soil-to-plant transfer factors for stable elements in lemon balm (Melissa Officinalis L.) commonly used as a medicinal plant2019 - SUSSA, FÁBIO V.; FURLAN, MARCOS R.; VICORINO, MARCOS; SILVA, PAULO S.C.This study evaluated the transfer factors (TF) of stable elements (essential and non-essential) As, Ba, Br, Ca, Cd, Co, Cr, Cu, Fe, Hf, K, La, Mg, Mn, Na, Ni, Pb, Rb, Sb, Sc, Sm, Th, Ti, V and Zn from soil to Melissa officinalis L. (Lemon balm). The transfer factors were calculated by dividing the metal concentration in Lemon balm leaf by the total metal concentrations in the soil. The experiments were conducted from January 2013 to January 2014 at the Municipal Gardening School area, in Ibirapuera Park, São Paulo, Brazil. The experimental design was completely randomized (CRD), with three treatment: control (site soil), organic (2 t ha-1 poultry manure) and conventional (30 t ha-1 of NPK, 6:14:8), and four harvest (April, July, October and January) with four replications. The soil samples collected (0 – 20 cm) were dried at 100 °C and grounded to 100 mesh size particles and homogenized. Lemon balm samples were collected and washed with ultrapure water to remove impurities and soil particles present in all plant structures, air-dried and the leaves were separated. After these processes, the Lemon balm leaves were dried at 100 °C and grounded to 100 mesh size particles. Instrumental neutron activation analysis (INAA), graphite furnace atomic absorption spectrometry (GFAAS) and inductively coupled plasma optical emission spectrometry (ICP-OES) were applied to determine the elemental concentration in the samples. The results showed that the metals accumulate in species with different intensity. Our findings indicated that Ca, Cd, K, Ni and Rb accumulated the most with the transfer factor of 1.0 – 12, followed by Ba, Br, Co, Cr, Cu, Mg, Mn, Na, Pb, Sb and Zn with TF of 0.1 – 1.0, while As, Fe, Hf, La, Sm, Th, Ti and V had the lowest accumulation with TF usually < 0.1.