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

Author

Listed:
  • Richard Koplík

    (Department of Food Analysis and Nutrition, Faculty of Food and Biochemical Technology, and)

  • Iva Klimešová

    (Department of Food Analysis and Nutrition, Faculty of Food and Biochemical Technology, and)

  • Kateřina Mališová

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

  • Oto Mestek

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

Abstract

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.

Suggested Citation

  • Richard Koplík & Iva Klimešová & Kateřina Mališová & Oto Mestek, 2014. "Determination of mercury species in foodstuffs using LC-ICP-MS: the applicability and limitations of the method," Czech Journal of Food Sciences, Czech Academy of Agricultural Sciences, vol. 32(3), pages 249-259.
    • Handle: RePEc:caa:jnlcjf:v:32:y:2014:i:3:id:577-2013-cjfs
    DOI: 10.17221/577/2013-CJFS
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