Total and inorganic mercury determination in biodiesel by emulsion sample introduction and FI-CV-AFS after multivariate optimization

An automated procedure for total and inorganic mercury determination in biodiesel by CV-AFS was studied. The samples were introduced directly as oil-in-water emulsions in a flow injection manifold followed by cold vapor generation coupled to atomic fluorescence spectrometry (FI-CV-AFS). After irradi...

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Bibliographic Details
Published in:Journal of analytical atomic spectrometry 2009-01, Vol.24 (10), p.1441-1445
Main Authors: Aranda, Pedro R., Pacheco, Pablo H., Olsina, Roberto A., Martinez, Luis D., Gil, Raúl A.
Format: Article
Language:English
Subjects:
Biodiesel
Digestion
Emulsions
Materials handling
Mathematical analysis
Mercury
Spectrometry
Spectroscopy
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Summary:An automated procedure for total and inorganic mercury determination in biodiesel by CV-AFS was studied. The samples were introduced directly as oil-in-water emulsions in a flow injection manifold followed by cold vapor generation coupled to atomic fluorescence spectrometry (FI-CV-AFS). After irradiation with an UV source, organic mercury (e.g. MeHg+ and PhHg+ among others) was decomposed. Mercury vapors were generated using an acidic SnCl2 solution in a continuous flow system and were then determined. This strategy reduced sample handling, avoiding sample contamination and analyte losses. The limit of detection was calculated as 0.2 [small micro]g Kg-1 (0.03 [small micro]g L-1 for the emulsions) and the relative standard deviation was better than 8% at levels of 3.0 [small micro]g L-1 in the emulsion, calculated from the peaks obtained. The accuracy was verified by comparing the results with a total microwave-assisted digestion.
ISSN:0267-9477
1364-5544
DOI:10.1039/b903113h