Aplicação de quimioterapia e espectroscopia no infravermelho no controle de qualidade de biodiesel e mistura biodiesel/diesel / Application of chemometrics and infrared spectroscopy in the quality control of biodiesel and biodiesel blend

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Multivariate control charts in jointly with near infrared spectroscopy were developed to verify the quality of biodiesel blends (2% of biodiesel and 98% of diesel). The control charts were built using the net analyte signal, generating three charts: the NAS chart that corresponds to the analyte of interest (biodiesel in this case), the interference chart that corresponds to the contribution of other compounds in the sample (diesel in this case) and the residual chart that corresponds to nonsystematic variations. For each chart, statistical limits were developed using samples inside the quality specifications. It was possible to identify biodiesel blend samples that were out of specifications relative to biodiesel content, biodiesel contaminated with vegetable oil and diesel contaminated with naphtha. In the present work it was also developed a model of multivariate calibration for the acid value determination of degraded biodiesel using the spectra in the near infrared region. The acid value, one biodiesel quality parameter, is related with the degree of biodiesel degradation. The developed model was based on the partial least squares method (PLS) and it was validated by figures of merit calculation. Feasible results were obtained with errors below to 3.4% and detection and quantification limits of 0.018 and 0.059 mg KOH/g, respectively.

ASSUNTO(S)

biodiesel carta de controle de qualidade biodiesel espectroscopia no infravermelho chemometric infrared spectroscopy quality control chart quimiometria

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