| Full text | |
| Author(s): |
Amais, Renata Stabile
;
Garcia, Edivaldo Egea
;
Monteiro, Marcos Roberto
;
Nobrega, Joaquim A.
Total Authors: 4
|
| Document type: | Journal article |
| Source: | BRAZILIAN JOURNAL OF ANALYTICAL CHEMISTRY; v. 1, n. 5, p. 5-pg., 2011-07-01. |
| Abstract | |
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) | |
| FAPESP's process: | 10/17387-7 - Assessment of spectroanalytical techniques and sample preparation procedures for the determination of sulfur in biodiesel and diesel blends |
| Grantee: | Renata Stábile Amais |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 06/59083-9 - Inductively coupled plasma mass spectrometry: fundamentals and applications |
| Grantee: | Joaquim de Araújo Nóbrega |
| Support Opportunities: | Research Projects - Thematic Grants |