Faas
Mostrando 1-12 de 178 artigos, teses e dissertações.
-
1. Atomic Absorption Spectrometry as an Alternative to Determine the Presence of Gold Nanoparticles on or in Silica Matrix
Two different gold-silica-based nanomaterials were prepared: (i) silica-supported gold nanoparticles (AuNP/SiO2); and (ii) gold-silica core-shell nanoparticles (AuNP@SiO2). Three strategies for sample treatment (S), consisting in acid treatments, were employed: (S1) HNO3; (S2) HNO3 + HCl; and (S3) HF + HNO3 + HCl, applying microwave oven digestion for S2 and
Journal of the Brazilian Chemical Society. Publicado em: 2022
-
2. Dispersive Solid-Phase Extraction Using 3-Mercaptopropyltrimethoxysilane Functionalized Magnetic MWCNT-Based Nanocomposite for Selective and Efficient Preconcentration of Pb2+ with FAAS Determination
A novel nanocomposite based on magnetic multiwalled carbon nanotubes coated with SiO2 and functionalized with 3-mercaptopropyltrimethoxysilane (3-MPTMS) was prepared for the efficient extraction and quantification of lead ions from water samples. The adsorption capacity of this adsorbent could reach 1.995 mg g-1 Pb2+ in an equilibrium time of 30 min. Under o
Journal of the Brazilian Chemical Society. Publicado em: 2022
-
3. Thallium Associated with Manganese Ore Tailings in a Deactivated Mine in the Western Region of Bahia, Brazil
Thallium (Tl) is a rare metal with toxic effects notably harmful to human health and the environment. In this article, the natural occurrence of Tl was evaluated in a deactivated manganese mine located in the western region of Bahia, Brazil. The extraction procedure with aqua regia was used to dissolve the soil, sediment, and tailings samples. The Tl content
J. Braz. Chem. Soc.. Publicado em: 2021-05
-
4. SEQUENTIAL MULTI-ELEMENT DETERMINATION OF TRACE-METALS IN BIODIESEL SAMPLES USING HR-CS FAAS
In this work the feasibility of sequential multi-element determination of Zn, Fe, Mg, Cu, Na, K, Cr, Al and Ca in biodiesel samples by high-resolution continuum source flame atomic absorption spectrometry (HR-CS FAAS) was investigated. Biodiesel samples obtained from different sources and different chemical processes were analysed. The samples were diluted w
Quím. Nova. Publicado em: 2021-02
-
5. MAIN MINERALS AND ORGANIC COMPOUNDS IN COMMERCIAL ROASTED AND GROUND COFFEE: AN EXPLORATORY DATA ANALYSIS
Coffee is one of the most popular beverages in the world, however, little information is found regarding the mineral composition of commercial roasted and ground coffees (RG) and its correlation with organic bioactive compounds. 21 commercial Brazilian RG coffee brands - 9 traditional (T) and 12 extra strong (ES) roasted ones - were analyzed for the Cu, Ca,
Quím. Nova. Publicado em: 2021-01
-
6. USO DE UM SCANNER DE MESA E ESPUMA DE POLIURETANO PARA QUANTIFICAÇÃO DE FERRO TOTAL EM CÁPSULAS DE SUPLEMENTOS ALIMENTARES
In this work, an alternative and low-cost technique for the extraction and quantification of Fe (total) from food supplements by digital image analysis is shown. The method is based on the complexation of Fe ions in solution with the 8-hydroxyquinoline ligand, forming a colored complex that is extractable from aqueous solution to polyurethane foam, coloring
Quím. Nova. Publicado em: 2021-01
-
7. Selected minerals concentration and microbiological safety in non-carcass bovine components of “PANELADA” dish
Abstract “Panelada” is a typical dish from Brazil, made up of some bovine non-carcass components (intestine, rumen and ox feet), whose nutritional value and microbiological quality are not reported. The total contents of selected minerals were determined using flame atomic absorption spectrometry (FAAS) and electrothermal (ETAAS) for samples of raw, seas
Food Sci. Technol. Publicado em: 2020-12
-
8. JORDAN-YOUNG, Rebecca; KARKAZIS, Katrina. 2019. Testosterone: an unauthorized biography. Cambridge: Harvard University Press. 288p.
RESUMO O objetivo deste estudo foi investigar as águas superficiais e os níveis foliares dos elementos-traço (Cu, Zn, Cd e Pb) da Avicennia schaueriana na área de proteção ambiental (APA) Tinharé-Boipeba, litoral sul da Bahia, com ênfase na relação entre a qualidade ambiental e o gerenciamento costeiro. Mensuraram-se in situ variáveis físico-quí
Sex., Salud Soc. (Rio J.). Publicado em: 2020-08
-
9. Qualidade das águas e análise de metais em folhas de mangue na APA Tinharé-Boipeba (BA)
RESUMO O objetivo deste estudo foi investigar as águas superficiais e os níveis foliares dos elementos-traço (Cu, Zn, Cd e Pb) da Avicennia schaueriana na área de proteção ambiental (APA) Tinharé-Boipeba, litoral sul da Bahia, com ênfase na relação entre a qualidade ambiental e o gerenciamento costeiro. Mensuraram-se in situ variáveis físico-quí
Eng. Sanit. Ambient.. Publicado em: 2020-08
-
10. Concentration of Metals in Plant Litter Produced in Regions of Caatinga in Southwest Bahia, Brazil
Plant litter has several functions in a forest ecosystem. Studies about plant litter are of great importance to better understand and conserve ecological environments. The objective of this study was to investigate the concentration of metals (Fe, Co, Ca, Cu, Ni, Mg, Mn and Zn) in Caatinga plant litter in the southwest region of Bahia. Plant litter was colle
J. Braz. Chem. Soc.. Publicado em: 2020-07
-
11. Por que Desenvolvemos Modelos – Da Prática Clínica de Cardiologia a Epidemias de Doenças Infecciosas
This work describes the bioaccessibility in vitro simulated gastric digestion for levels of Zn, Ca, and P in milk and soybean extract samples. Total and dialyzed levels were determined by ICP OES. According to results of the dialyzed samples, it can be concluded that in 250 mL of milk (a glass) the body can be absorb about 1.2 ± 0.2 mg, 14.8 ± 1.2 mg, 4.5
Arq. Bras. Cardiol.. Publicado em: 2020-06
-
12. BIOACESSIBILIDADE DE ZINCO, CÁLCIO E FÓSFORO EM EXTRATO DE SOJA E AMOSTRAS DE LEITE BOVINO, CAPRINO E OVINO
This work describes the bioaccessibility in vitro simulated gastric digestion for levels of Zn, Ca, and P in milk and soybean extract samples. Total and dialyzed levels were determined by ICP OES. According to results of the dialyzed samples, it can be concluded that in 250 mL of milk (a glass) the body can be absorb about 1.2 ± 0.2 mg, 14.8 ± 1.2 mg, 4.5
Quím. Nova. Publicado em: 2020-06