| Texto completo | |
| Autor(es): |
Amais, Renata Stabile
;
Garcia, Edivaldo Egea
;
Monteiro, Marcos Roberto
;
Nobrega, Joaquim A.
Número total de Autores: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | BRAZILIAN JOURNAL OF ANALYTICAL CHEMISTRY; v. 1, n. 5, p. 5-pg., 2011-07-01. |
| Resumo | |
In this work an analytical procedure was developed for analysis of biodiesel microemulsions using inductively coupled plasma optical emission spectrometry (ICP OES) with axial configuration. Microemulsions were prepared using 0.5 mL of 20 % v v(-1) HNO3, 0.5 mL of Triton X-100, and 1.0 mL of biodiesel sample and diluted with n-propanol to a final volume of 10 mL. Oxygen addition to the composition of the auxiliary gas to reduce Swan band emissions and possible matrix effects was studied and the best conditions were reached at a flow rate of 165 mL min(-1). Nebulization gas flow rate for ICP OES was kept at 0.7 L min(-1) based on both signal-to-background ratio (SBR) and signal intensities for Ca, K, Mg, Na, P and S determinations. Analytical performance was evaluated and good linear correlations (r > 0.99) were observed for several monitored emission lines. The accuracy of the procedure was checked by addition and recovery experiments for different types of biodiesel samples and recoveries ranged from 103.3 to 117.5, 93.5 to 113.5, 76.3 to 92.5 and 88.3 to 116.1% for Ca, Mg, P and S determinations, respectively. However, accuracy for Na and K determinations was not adequate, probably due to the complex matrix composition with high carbon content and the strong ionization of both analytes in the adopted plasma conditions. (AU) | |
| Processo FAPESP: | 10/17387-7 - Avaliação de técnicas espectroanalíticas e procedimentos de preparo de amostras para a determinação de enxofre em biodiesel e misturas com diesel |
| Beneficiário: | Renata Stábile Amais |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 06/59083-9 - Espectrometria de massa acoplada ao plasma induzido: aspectos fundamentais e aplicações |
| Beneficiário: | Joaquim de Araújo Nóbrega |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |