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Itens para a visualização no momento 11-20 of 23
Síntese de partículas submicrométricas de carbonato de cálcio a partir de sais inorgânicos utilizando polímeros lineares como modificadores de cristalização
(Universidade Federal de Santa Maria, 2017)
In this work, we report the synthesis of submicrometer calcium carbonate
particles using the simplest approach of mixing solutions of calcium chloride
and ammonium carbonate inorganic precursors in presence of ...
Extração e adsorção de HPAs através de transferência gás- sólido (XAD-2 e EPU) utilizando dispositivo de extração e coleta
(Universidade Federal de Santa Maria, 2017-04-27)
Polycyclic Aromatic Hydrocarbons (PAHs) are organic compounds formed by two or more condensed aromatic rings. These compounds are important organic pollutants and due to their harmful action their concentrations in the ...
Decomposição assistida por radiação micro-ondas e ultravioleta de resíduos de equipamentos elétricos e eletrônicos para determinação de Br, Cd, Cr, Hg, Pb e Sb
(Universidade Federal de Santa Maria, 2017-03-09)
In this work, a method for ultraviolet and microwave-assisted wet digestion (MAWD-UV) was developed for digestion of waste electrical and electronic equipment (WEEE) for further determination of Br, Cd, Cr, Hg, Pb and Sb ...
Determinação de elementos traço em carvão por amostragem de sólidos e vaporização eletrotérmica acoplada à espectrometria de massa com plasma indutivamente acoplado
(Universidade Federal de Santa Maria, 2017-07-28)
In this work, a method using solid sampling electrothermal vaporization inductively coupled plasma mass spectrometry (SS-ETV-ICP-MS) for the determination of As, Sb, Se and Te in mineral coal was developed. The following ...
Métodos simplificados de síntese de copolímeros através da combinação das técnicas SET-LRP e ROP
(Universidade Federal de Santa Maria, 2017-02-10)
The present work focuses on the synthesis of diblock copolymers of the type polyester-block-poly(acrylate) by one-pot methodology, by combining the polymerization techniques ROP and SET-LRP. The proposed strategy was based ...
Avaliação de sorventes para remoção de clorofila na determinação de agrotóxicos em espinafre empregando método QuEChERS e GC-ECD
(Universidade Federal de Santa Maria, 2017-03-30)
Vegetables are classified as greens when used on green parts and play an important role in human diet and nutrition. These foods are sources of vitamins, antioxidant polyphenols, essential amino acids, fibers, minerals, ...
Determinação de hidrocarbonetos policíclicos aromáticos utilizando calibração multivariada
(Universidade Federal de Santa Maria, 2017-01-31)
A method was developed to determine low molecular weight polycyclic aromatic hydrocarbons (naphthalene, anthracene, fluorantene, phenanthrene and acenaphthene) in aqueous leachates from soils and sediments using a salting-out ...
Decomposição de amostras de alimentos empregando ácido nítrico diluído e pressurização com diferentes gases em sistema de câmara única de reação assistida por radiação micro-ondas
(Universidade Federal de Santa Maria, 2017-03-23)
In the present work the use of a microwave-assisted wet digestion using a single reaction chamber system (MAD-SRC) at high pressure and temperature was evaluated for digesting food samples. It was evaluated the use of ...
Determinação de hidrocarbonetos policíclicos aromáticos (HPAs) em mexilhão empregando o método QuEChERS e HPLC-FD
(Universidade Federal de Santa Maria, 2017-07-20)
The consumption of fish and seafood is considered an important element of a balanced diet. The mussel is a bivalve mollusk which is fed by filtration of organic particles present in suspension in water. In recent years, ...
Rotâmeros de [2]rotaxanos: estudo do efeito do macrociclo sobre o eixo molecular
(Universidade Federal de Santa Maria, 2017-07-20)
This work presents the synthesis of three new threads and three new [2]rotaxanes models that have asymmetric stopprs, which allows rotamers to be obtained. The synthesis of the [2]rotaxanes was performed by clipping reaction, ...