Speciation of mercury by continuous flow liquid-liquid extraction and inductively coupled plasma atomic emission spectrometry detection |
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Authors: | A. Menéndez García M. L. Fernández Sánchez J. E. Sánchez Uría A. Sanz Medel |
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Affiliation: | (1) Department of Physical and Analytical Chemistry, Faculty of Chemistry, University of Oviedo, E-33006 Oviedo, Spain |
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Abstract: | An accurate, precise, sensitive and automated non-chromatographic method for methylmercury speciation based on a selective continuous liquid-liquid extraction of methylmercury, into xylene, as bromide and cold mercury vapour generation directly from the organic phase and final ICP-AES mercury detection is proposed. Both separation steps, liquid-liquid and gas-liquid are accomplished in a continuous mode and on line with ICP-AES as detector. The detection limit attained for methylmercury was 4ng·ml–1 (as mercury). The precision of the determination at a concentration level around 20 times the detection limit was +-5%. The proposed methodology has been applied successfully to the speciation of methylmercury and inorganic mercury in spiked sea water and spiked urine samples. |
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Keywords: | methylmercury inorganic mercury tandem on-line separations liquid-liquid extraction continuous flow ICP-AES |
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