An international proficiency test as a tool to evaluate mercury determination in environmental matrices

作者：Reis Ana Teresa^*; Duarte Armando C; Henriques Bruno; Coelho Claudia; Lopes Claudia Batista; Mieiro Claudia L; Tavares Daniela Santos; Ahmad Lqbal; Coelho Joao Pedro; Rocha Luciana Sarabando; Cruz Nuno; Monteiro Rui J R; Rocha Rui; Rodrigues Sonia; Pereira Eduarda

来源：TrAC-Trends in Analytical Chemistry, 2015, 64: 136-148.

DOI：10.1016/j.trac.2014.08.015

• Fish
• Homogeneity test
• Human hair
• Inter laboratory exercise
• Mercury extraction
• Proficiency test
• Sediment
• Soil
• Total mercury
• z-score

We report on an international proficiency test (PT) scheme for mercury (Hg) determination in soil, sediment, fish and human-hair samples (ILAE-Hg-02). For total-Hg determination, 74% of participants had a satisfactory performance (vertical bar z-score broken vertical bar <= 2), 8% had a questionable performance and 18% required action (vertical bar z-score vertical bar > 3). The best results were obtained for soil, while fish yielded the most-biased results, reflecting the analytical problems of quantifying Hg at low concentrations. Proficiency in the extraction of organotnetallic and available metal fractions was an important goal of the ILAE-Hg-02 and it was concluded that most laboratories are still not acquainted with the procedures for Hg fractionation; we therefore discuss their importance and highlight the need for more PT schemes dedicated to this matter, as they are an important tools in the standardization of procedures and for the development of adequate quality control/quality analysis protocols and certified reference materials.

• 出版日期2015-1