期刊
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
卷 28, 期 2, 页码 280-287出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ja30306j
关键词
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资金
- Fundacao de Amparo a Pesquisa do Estado de So Paulo (FAPESP) [2006/59083-9, 2010/50238-5, 2010/17387-7]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologic (CNPq)
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.
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