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Itens para a visualização no momento 21-30 of 34
Método multirresíduo rápido para a determinação de agrotóxicos em abobrinha empregando QuEChERS modificado e UHPLC-MS/MS
(Universidade Federal de Santa Maria, 2022-10-14)
In the last decades, the use of pesticides in Brazil and in the world has increased substantially, mainly due to the demand for food. Brazil stands out in the international scenario, mainly in the production and cultivation ...
Determinação de cobre em cerveja por espectrometria de absorção atômica com chama após microextração líquido-líquido dispersiva
(Universidade Federal de Santa Maria, 2022-09-21)
In this work, a sample preparation method was developed using the dispersive liquidliquid microextraction (DLLME) for the Cu extraction and pre-concentration in beer,
followed by the determination by flame atomic absorption ...
Método multirresíduo para determinação de agrotóxicos em mamão empregando QuEChERS e UHPLC-MS/MS
(Universidade Federal de Santa Maria, 2022-10-21)
Papaya is the fourth most consumed fruit in Brazil and the third most exported fruit by
the country. In search of better results in production and greater resistance to diseases
and pests, pesticides have their widespread ...
Determinação de resíduos de agrotóxicos em canola empregando método QuEChERS e UHPLC-MS/MS
(Universidade Federal de Santa Maria, 2022-09-09)
Rapeseed has been used as green fodder for animal feed, fertilizer for soil
conditioning, and as a raw material for oil extraction. It has been used as human food,
for industrial use, and more recently for the production ...
Caracterização química elementar de biomassa lignocelulósica, biochar e bio-óleo
(Universidade Federal de Santa Maria, 2023-01-19)
In this work, sample preparation methods for the digestion of lignocellulosic biomass
as well as biochar and bio-oil were developed for further elemental determination.
For lignocellulosic biomass, the microwave assisted ...
Extração líquido-líquido miniaturizada para determinação de Li, Na, K, Ba, Ca, Mg e Sr em petróleo por ICP-OES
(Universidade Federal de Santa Maria, 2022-10-27)
In this study, a miniaturized ultrasound combined liquid-liquid extraction (US-LLE) method was
developed for the extraction and subsequent Li, Na, K, Ba, Ca, Ca, Mg and Sr determination by
ICP-OES in crude oils. For the ...
Determinação multirresíduo de agrotóxicos em abelha (Apis mellifera) empregando mini-QuEChERS e UHPLC-MS/MS
(Universidade Federal de Santa Maria, 2022-10-28)
Brazil has a favorable climate for extensive agricultural production, which is generally associated with the intensive use of pesticides. The harmful effect of pesticides on bee health is a topic of global concern. In the ...
Desenvolvimento de metodologia para análise de especiação de cromo em fertilizantes orgânicos
(Universidade Federal de Santa Maria, 2022-10-28)
In this work, a methodology was developed for the analysis of chromium speciation in organic fertilizer by liquid chromatography coupled to inductively coupled plasma mass spectrometry (LC-ICP-MS). For the evaluation of ...
Determinação de flúor em sementes de plantas leguminosas e oleaginosas após combustão iniciada por micro-ondas em frascos descartáveis
(Universidade Federal de Santa Maria, 2023-03-10)
In this work, the use of microwave-induced combustion in disposable vessels (MIC-DV) for fluoride determination in leguminous seeds and oilseeds (almond, peanut, hazelnut, Brazil nut, pecan nut, pea, pinto bean, chickpea, ...
Método de preparo de amostras em câmara única de reação assistida por radiação micro-ondas e determinação de elementos terras raras em azeite de oliva extra virgem por USN-ICP-MS
(Universidade Federal de Santa Maria, 2022-12-16)
The rare earth elements (REE) present in extra virgin olive oil (EVOO) have been
considered as studied markers for traceability of the production origin. However, REE
are present in low concentrations (ng g-1
range) in ...