Determination of monomethylmercury in low- and high-polluted sediments by microwave extraction and gas chromatography with atomic fluorescence detection

Analytica Chimica Acta
J J Berzas NevadoM Jiménez Moreno

Abstract

The analysis of monomethylmercury (MMHg) in sediments is a difficult task because both very low concentrations and interconversion between species especially in highly polluted samples are frequent. This work features a general strategy for real sediment analysis with preconcentration and/or clean-up steps for both low- and high-polluted sediments to control these specific problems. The extraction conditions have been optimized using closed-vessel microwave-assisted heating with acidic extractants. The analysis has been carried out by the injection of ethylated derivatives of the analytes into a capillary gas chromatographic system coupled to fluorescence spectrometry. When using 6M HNO3, the most labile inorganic mercury fraction as well as MMHg were extracted from the sediment but there was still some inorganic mercury that remained un-extracted. MMHg was stable and quantitatively recovered by applying this procedure. The role of the labile inorganic fraction on artifact MMHg generation has been evaluated and it has been found to be highly variable depending on the sediments' geochemical characteristics. Therefore, for high-polluted sediments (inorganic mercury concentration above 500 ngg(-1)) a clean-up step with dichloromet...Continue Reading

Citations

May 23, 2012·Archives of Environmental Contamination and Toxicology·Qianqian ChenJing Huang
Feb 9, 2012·Journal of Environmental Monitoring : JEM·Milada KadlecováHana Dočekalová
Jan 27, 2009·The Science of the Total Environment·Juan J Berzas NevadoMaría Jiménez Moreno
Sep 13, 2012·Talanta·J J Berzas NevadoM J Patiño Ropero
Dec 4, 2014·Analytica Chimica Acta·Luis Carrasco, Emilia Vassileva
Sep 18, 2017·Talanta·María Jiménez-MorenoRosa Carmen Rodríguez Martín-Doimeadios
May 15, 2010·Analytical Chemistry·Nicolas H BingsJosé A C Broekaert

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