姬松茸粉中总汞、甲基汞标准物质的研制

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

目的研制姬松茸基质的总汞及甲基汞的标准物质。方法筛查市售食用菌,选择总汞、甲基汞含量适宜的姬松茸为原料,经干燥、研磨、筛分、混匀等过程制得候选标准物质。通过均匀性检验和稳定性检验后,组织7个实验室协作定值,并分析评估其不确定度。结果经检验研制的标准物质均匀性、稳定性良好。姬松茸粉中总汞含量为0.586 mg/kg,扩展不确定度为0.026 mg/kg;甲基汞含量为0.0227 mg/kg,扩展不确定度为0.0015 mg/kg。结论该标准物质量值稳定,准确可靠,可为食品、环境等领域中总汞及甲基汞的量值溯源、分析质量控制等提供技术支持。

Objective To prepare reference materials of total mercury and methyl mercury in Agaricus blazei murill.Methods Agaricus 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.Results The 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 0.0227 mg/kg,and the expanded uncertainty was 0.0015 mg/kg.Conclusion The reference material has good stability,can be used for traceability and quality control of analyzing.