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Determinação multiresidual de agrotóxicos em camas biológicas empregando cromatografia gasosa acoplada à espectrometria de massas
(Universidade Federal de Santa Maria, 2018-12-03)
Pesticides are used worldwide to control pests and diseases in various crops in order to avoid losses, thus increasing production. Considering the toxicity of pesticides, both for the environment and for health, there is ...
Determinação do grau API e teor de enxofre e nitrogênio em petróleo usando ATR-FTIR e métodos quimiométricos
(Universidade Federal de Santa Maria, 2019-11-25)
Parameters such as API gravity and sulfur and nitrogen concentrations are important to determine crude oil quality. API, S and N grade determinations were evaluated by ASTM D-7042, ASTM D-5453 and ASTM D-4629 methods, ...
Método gravimétrico de Payzant em amostras de cimento asfáltico: uma investigação analítica para reduzir o consumo de reagentes e a geração de resíduos
(Universidade Federal de Santa Maria, 2019-11-25)
This work presents alternative methodologies to fractionation of petroleum asphalt cement (CAP) in sulfur species (saturated/aromatic compounds, thiophenic compounds and sulfide compounds) proposed by Payzant (1989). The ...
Avaliação de sensor de turbidez comercial para determinação de K disponível em solo
(Universidade Federal de Santa Maria, 2023-01-13)
Nutrient availability is essential so the crop can reach its maximum yield. Potassium is
an element that has a great influence on this matter since it has several functions in
the plant like regulation of osmotic pressure. ...
Análise de especiação química de cromo em fertilizantes orgânicos
(Universidade Federal de Santa Maria, 2023-02-13)
Tannery waste is constituted of organic materials of animal origin mixed with inorganic
salts. Among them, nutrients that are essential to plants and microorganisms, such as
nitrogen, calcium, sulfur, phosphorus, magnesium ...
Determinação de cafeína, teobromina e ácido clorogênico em erva-mate por HPLC-DAD e UHPLC-MS/MS
(Universidade Federal de Santa Maria, 2023-06-14)
Yerba mate (Ilex paraguariensis) is a very consumed product in the south of South America,
mainly in the south of Brazil, which is one of the largest producers of it. It can be consumed in
several ways, but the main one ...