Journal
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
Volume 24, Issue 10, Pages 1441-1445Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b903113h
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- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET)
- Agencia Nacional de Promocion Cientifica y Tecnologica (FONCYT) (PICT-BID)
- Universidad Nacional de San Luis (UNSL) (Argentina)
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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 mu g Kg(-1) (0.03 mu g L-1 for the emulsions) and the relative standard deviation was better than 8% at levels of 3.0 mu 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.
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