ERM-AE671 consists of pure, 202Hg enriched methylmercury in 2 % ethanol/water solution. It is supplied in flame-sealed quartz ampoules, containing 5 g solution. The CH3Hg amount content of ERM-AE671 was established by multiplication of the certified CH3Hg value of ERM-AE670 with the gravimetric dilution factor.
The correctness of the dilution was verified by measurement if the inorganic Hg content and the total Hg content. The inorganic Hg2+ content was measured by ion-exchange-ICP-SFMS. The gravimetric dilution was additionally verified by measurement of the total Hg content in ERM-AE671 by ID-ICP-MCMS with ERMAE639 used as a spike material. The main purpose of the material is to be used as spike isotopic reference material for determination of CH3Hg content in an unknown samples by species-specific isotope dilution through a measurement of the mercury isotope amount ratio R(B) = n(200Hg)/n(202Hg) of CH3Hg, in a blend.
Before use, the material must be allowed to reach ambient temperature. The ampoule should be cleaned with a dust-free wipe wetted with purified water before opening. The material is ready for use after ampoule opening.
keywords: trace elements , speciation analysis , mercury speciation
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