Determinação de levoglucosano em material particulado atmosférico e água de chuva utilizando dispositivos analíticos fabricados em papel
Nenhuma Miniatura disponível
Data
2018-02-26
Autores
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Federal de Goiás
Resumo
Air pollution is an environmental problem present in many regions of the world. Aerosols or
particulate matters (PM) are atmospheric pollutants associated with climate changes and human
health, and prompt a great number of deaths each year. In Brazil, the forest fires and the burning
of sugarcane are some of the sources of emissions of gases and PM into the atmosphere. The
anhydrosugar levoglucosan and its stereoisomers, mannosan and galactosan, are biomass burning
markers, because they are produced by cellulose pyrolysis at high temperatures. This work
developed a method using Paper-based Analytical Devices (PADs) with colorimetric detection to
determine biomass burning markers in samples of PM and rainwater of Goiânia city. In this method,
the levoglucosan present in the samples was hydrolyzed to glucose, and after an enzymatic reaction,
showed a magenta coloration using a chromogen agent. The PADs were scanned generate a digital
image, and the color intensities were correlated with the analyte concentrations. The method
showed a conversion rate of levoglucosan to glucose of 81%, good linearity in the range of 0 to 0.4
mmol.L-1
, a limit of detection (LD) of 2 μg.mL-1
and a limit of quantification (LOQ) of 6 μg.mL-1
for hydrolysis in sulfuric acid. Moreover, the method presented selectivity for these markers,
because the interferents can be detected and quantified. The concentrations of levoglucosan
determined in PM were high and varied from 0.08 to 1.10 μg.m-3
(0.44 ± 0.29; n = 10), these
concentrations were similar to those obtained in the Amazon, which is a region exposed to
extensive biomass burning due to deforestation. In rainwater samples, collected in two different
events, levoglucosan was detected showing that biomass burning has a significant contribution in
the emission of gases and PM in Goiânia atmosphere. The method developed in this work using
PADs with colorimetric detection was successfully apllied to levoglucosan determination in PM
and rainwater samples. This process used low volume of samples and reagents, the analysis are
rapid, the operation is easy, the cost of production is low and the devices are portable, being an
advantageous technique.
Descrição
Palavras-chave
Citação
DIAS, Isabela Milhomem. Determinação de levoglucosano em material particulado atmosférico e água de chuva utilizando dispositivos analíticos fabricados em papel. 2018. 52 f. Dissertação (Mestrado em Química) - Universidade Federal de Goiás, Goiânia, 2018.