Development and certification of a reference material for total mercury and methyl mercury in Agaricus blazei murill Powder

Abstract

ObjectiveTo prepare reference materials of total mercury and methyl mercury in Agaricus blazei murill.MethodsAgaricus blazei murill with suitable content of total mercury and methylmercury were screening from markets. After drying， grinding， screening， homogenized and packed， the reference materials were obtained. After homogeneity and stability tests， coordinated values were determined by seven laboratories， and the uncertainties were evaluated.ResultsThe characteristic value of total mercury was 0.586 mg/kg， and the expanded uncertainty was 0.026 mg/kg. The characteristic value of methylmercury was 0.022 7 mg/kg， and the expanded uncertainty was 0.001 5 mg/kg.ConclusionThe reference material has good stability， can be used for traceability and quality control of analyzing.

Keywords

• mercury
• methyl mercury
• agaricus blazei murill
• matrix reference material