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Desenvolvimento de métodos de preparo de amostras para a posterior determinação de metais alcalinos, alcalino-terrosos e halogênios em petróleo
(Universidade Federal de Santa Maria, 2020-03-27)
In this work, four sample preparation methods were
investigated for further alkaline, alkaline earth
metals and halogens determination in crude oil: i ) microwave assisted wet digestion using a pressurized
digestion ...
Combustão iniciada por micro-ondas em frascos descartáveis para determinação de níquel e lantânio em nanotubos de carbono por técnicas espectrométricas
(Universidade Federal de Santa Maria, 2023-03-10)
In this work, the use of microwave-induced combustion in disposable vessels (MIC-DV)
was proposed for the digestion of carbon nanotubes (CNT) and subsequent determination
of Ni and La using colorimetry (for Ni) and ...
The influence of heteroatoms on the adsorption of fluorene and analogues onto high-density polyethylene and polyurethane microplastics
(Universidade Federal de Santa Maria, 2023-08-30)
Hidrocarbonetos Policíclicos Aromáticos (HPAs) são poluentes orgânicos hidrofóbicos,
classificados como mutagênicos e carcinogênicos, encontrados em misturas complexas na
natureza na sua forma básica e, em seus derivados ...
Ciclização eletrofílica de N- (etóxicarbonil)alquinilindois promovida por eletrófilos: síntese e caracterização de oxazinoindolonas 4- substituídos
(Universidade Federal de Santa Maria, 2023-08-11)
In this work a methodology was developed for the synthesis of 4-substituted
oxazinoindolones through a nucleophilic cyclization of N-(ethoxicarbonil)alkynylindois
produced by electrophiles. Initially, the first studies ...
Desenvolvimento de sistema FI-CVG-ICP-MS para determinação de mercúrio em peixe
(Universidade Federal de Santa Maria, 2023-06-26)
Mercury (Hg) is a toxic element that can accumulate in the environment and in the food chain due to its biomagnification and bioaccumulation. A high concentration of Hg in the human body can lead to health complications, ...
Síntese de nanoadsorventes e chars a partir da pirólise de bagaço de uva para fins de adsorção
(Universidade Federal de Santa Maria, 2022-10-01)
Graphene has received great attention due to its excellent properties. Commonly, its
synthesis is carried out from graphite. However, because graphite is a non-renewable
material, it is necessary to develop graphene ...
Síntese de novos sulfetos vinílicos derivados de 3- carbaldeído indóis via reações de Wittig-Horner
(Universidade Federal de Santa Maria, 2023-08-25)
This work describes the synthesis of 15 novel vinyl sulfides based on a series of
substituted indoles via Wittig-Horner reaction. The synthesized products were obtained
in yields ranging from 255 to 93%. Initially, ...
Estudo de reações de flúor-inserção em 1H-pirazóis utilizando os reagentes fluorantes selectfluor, DAST e MFSDA
(Universidade Federal de Santa Maria, 2015-08-19)
This thesis describes the studies carried out using fluorinating reagents with different approaches: Selectfluor as an electrophilic fluorine source; DAST for nucleophilic fluorinations and MFSDA as a nucleophilic ...
Determinação de resíduos e contaminantes em rações empregando extração sólido-líquido e UHPLC-MS/MS
(Universidade Federal de Santa Maria, 2022-11-18)
Animal feed is considered as any material of vegetable, animal or mineral origin
suitable to be consumed as food, provided it meets the quality and identity standards,
as well as sanitary and nutritional standards. Also ...
Determinação multiclasse de contaminantes em suplemento alimentar à base de óleo de peixe por GC-MS/MS
(Universidade Federal de Santa Maria, 2022-10-26)
In recent years, the demand for fish oil-based supplements has increased significantly, which
can be mainly attributed to the high concentrations of polyunsaturated fatty acids present in
fish, which are associated with ...