Czech J. Food Sci., 2014, 32(3):249-259 | DOI: 10.17221/577/2013-CJFS

Determination of mercury species in foodstuffs using LC-ICP-MS: the applicability and limitations of the methodOriginal Paper

Richard Koplík¹, Iva Klimešová¹, Kateřina Mališová², Oto Mestek²

¹ Department of Food Analysis and Nutrition, Faculty of Food and Biochemical Technology, and

² Department of Analytical Chemistry, Faculty of Chemical Engineering, Institute of Chemical Technology Prague, Prague, Czech Republic

Reversed-phase liquid chromatography hyphenated with inductively coupled plasma mass spectrometry (LC-ICP-MS) was used for mercury speciation analysis in food samples. A short chromatographic column (Purospher^® RP-8e, 75 ´ 4 mm, 3 µm) and a mobile phase containing 0.02 mol/l CH₃COONH₄ + 0.2% (v/v) 2-mercaptoethanol (2-ME) + 1% (v/v) CH₃OH were applied. A repeated extraction of samples with hydrochloric acid/2-ME solution (1 mol/l HCl + 0.2% (v/v) 2-ME) was applied as the isolation step. The results were satisfactory for most food matrices (fish, shellfish, plant materials). Conversely, to analyse high-protein animal matrices, which contain mostly the inorganic form of mercury, a procedure including partial hydrolysis using hydrochloric acid should be used. For methylmercury and inorganic divalent mercury, the LOQ values of 0.3 and 2 ng/g, respectively, can be achieved if precautionary measures against contamination are fulfilled. The method was applied for the determination of methylmercury and inorganic divalent mercury in fish, vegetables, herbs and cereal products.

Keywords: mercury speciation; liquid chromatography; inductively coupled plasma-mass spectrometry

Published: June 30, 2014  Show citation