3 documents found, page 1 of 1
Brown sugar characterization based on sucrose, Cu, Ca, Na, Fe and Mg contents
Natalino, Ricardo; Reis, Efraim Lázaro; Reis, Cesar; Fidêncio, Paulo Henrique; Mayrink, Maria Isabel Cristina BatistaSamples of light brown sugar (DPC) and dark sugar (DPE) were analyzed, determining their characteristics, based on metal concentration and sucrose data, through of the principal component analysis (PCA). For this purpose, a matrix with 97 sugar samples and 6 variables (sucrose, Cu, Ca, Na, Fe and Mg) was obtained, self-scaling the data with zero mean and unit variance. The principal component analysis showed th...
Determinação de constituintes químicos em madeira de eucalipto por Pi-CG/EM e c...
Nunes, Cleiton Antônio; Lima, Claudio Ferreira; Barbosa, Luiz Cláudio de Almeida; Colodette, Jorge Luiz; Fidêncio, Paulo HenriqueMultivariate models were developed using Artificial Neural Network (ANN) and Least Square - Support Vector Machines (LS-SVM) for estimating lignin siringyl/guaiacyl ratio and the contents of cellulose, hemicelluloses and lignin in eucalyptus wood by pyrolysis associated to gaseous chromatography and mass spectrometry (Py-GC/MS). The results obtained by two calibration methods were in agreement with those of ref...
Assessment of bioavailability of heavy metals after vermicomposting in the pres...
Damasceno, Odilaine Inácio de Carvalho; Reis, César; Reis, Efraim Lázaro; Bellato, Carlos Roberto; Fidêncio, Paulo HenriqueOs metais pesados presentes no lixo eletrônico, descartado de forma inadequada, podem se tornar biodisponíveis após a vermicompostagem, representando risco ao ambiente. Foram realizados experimentos de vermicompostagem em pequena escala na presença de placas de circuito impresso (PCI) para investigar a migração de metais pesados (Cu, Pb, Zn, Ni e Sn) para o composto obtido, assim como a mobilidade e biodisponib...