Collaborative study on determination of mono methylmercury in seafood. (1st March 2016)

• Record Type: Journal Article
• Authors: Valdersnes, Stig; Fecher, Peter; Maage, Amund; Julshamn, Kaare
• Is Part Of: Food chemistry. Volume 194(2016)
• Page Start: 424
• Page End: 431
• Publication Date: 2016-03-01
• Subjects: Methylmercury (PubChem CID: 6860) -- Tetramethylammonium hydroxide (PubChem CID: 60966) -- Acetic acid (PubChem CID: 176) -- Sodium hydroxide (PubChem CID: 14798) -- Sodium acetate (PubChem CID: 517045) -- Nitric acid (PubChem CID: 944) -- Sodium tetraethylborate (PubChem CID: 23681030) -- Hexane (PubChem CID: 8058) -- Argon (PubChem CID: 23968) -- Helium (PubChem CID: 23987); Mono methylmercury -- Mercury -- Collaborative study -- Inter-laboratory method performance -- Standard method -- Codex -- Maximum limit -- Seafood safety; Food -- Analysis -- Periodicals; Food -- Composition -- Periodicals; 664
• DOI: 10.1016/j.foodchem.2015.08.041
• Languages: English
• ISSNs: 0308-8146

Abstract

Highlights: Collaborative study in accordance with international harmonised guidelines. Eight laboratories participated and seven seafood products were determined. Concentrations ranged from 0.035 to 3.58 mg/kg and HorRat ranged from 0.28 to 1.57. Method is fit for purpose and may serve as a future standard method for MMHg. Abstract: Eight laboratories participated in an inter-laboratory method-performance (collaborative) study of a method for the determination of mono methylmercury (MMHg) in foodstuffs of marine origin by gas chromatography inductively coupled plasma isotope dilution mass spectrometry (GC–ICP-IDMS) after dissolution, derivatisation and extraction of the species. The method was tested on seven seafood products covering both a wide concentration range and variations in the MMHg concentrations as well as matrix compositions. The samples were mussel tissue, squid muscle, crab claw meat, whale meat, cod muscle, Greenland halibut muscle and dogfish liver (NRCC DOLT-4), with MMHg concentrations ranging from 0.035 to 3.58 mg/kg (as Hg) dry weight. Repeatability relative standard deviations (RSDr ) for MMHg ranged from 2.1% to 8.7%. Reproducibility relative standard deviations (RSDR ) ranged from 5.8% to 42%. All samples showed HorRat value below 1.0, except for the sample with the lowest MMHg content, mussel tissue, with a HorRat value of 1.6.