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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Tungsten coil electrothermal matrix decomposition and sample vaporization to determine P and Si in biodiesel by inductively coupled plasma mass spectrometry

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Author(s):
Donati, George L. [1] ; Amais, Renata S. [1] ; Nobrega, Joaquim A. [1]
Total Authors: 3
Affiliation:
[1] Univ Fed Sao Carlos, Dept Chem, Grp Appl Instrumental Anal, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Journal of Analytical Atomic Spectrometry; v. 28, n. 2, p. 280-287, FEB 2013.
Web of Science Citations: 17
Abstract

A tungsten coil extracted from commercially available microscope light bulbs is used to decompose the organic matrix and vaporize biodiesel samples for P and Si determination by electrothermal vaporization inductively coupled plasma mass spectrometry (ETV-ICP-MS). The vaporization cell is connected to a modified sheath gas tube so that sample vapors are mixed with a continuous aerosol flow exiting the ICP-MS nebulization chamber. Helium and H-2 are used with a collision reaction interface (CRI) to minimize spectral interferences and obtain low baseline spectra. These strategies contribute to improving repeatability and accuracy. A small solid state constant current power supply is used to resistively heat the vaporizer and 10 mu l sample aliquots are introduced manually on the coil with a micropipette. Limits of detection of 0.4 and 0.1 mg kg(-1) are obtained for P and Si, respectively. Reference biodiesel samples are used to check the accuracy of the procedure for P. A spike experiment is carried out to assess accuracy in Si determinations. No statistically significant differences are observed for reference and determined values by applying a t-test at a 95% confidence level. The direct analysis of biodiesel by tungsten coil ETV-ICP-MS is a fast and effective alternative to determine challenging elements like P and Si. (AU)

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
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