直接测汞仪测定食品中鱼类、肉类和蛋类汞含量的不确定度评定

Evaluation of Uncertainty of Direct Mercury Measuring Instrument for Measuring Mercury Content in Fish,Meat and Eggs in Food

采用直接测汞仪测定罗非鱼、猪肉和鸡蛋,建立不确定度的数学模型,以此分析该方法不确定度的来源。通过对各分量的来源分析、计算和合成,结果表明,对样品中汞质量测定过程引入的不确定度贡献最大为标准曲线拟合过程,其次为储备液配制以及标准系列工作液配制,第三为重复性测定引入的不确定度;经过最终合成评定,罗非鱼中总汞结果可表示为(15.2±2.00)μg·kg-1,K=2;猪肉中总汞结果可表示为(7.20±1.79)μg·kg-1,K=2;鸡蛋中总汞结果可表示为(6.61±1.84)μg·kg-1,K=2。

Determination of total mercury in tilapia,pork and eggs by direct mercury analyzer,The sources of uncertainty of this method are analyzed by making mathematical model.By analysis,calculation and synthesis of components,the results show that the most important contribution of the uncertainty is standard curve fitting.After final synthesis evaluation,The results of total mercury in tilapia can be expressed as(15.2±2.00)μg·kg-1,K=2,The results of total mercury in pork can be expressed as(7.20±1.79)μg·kg-1,K=2,Total mercury in eggs can be expressed as(6.61±1.85)μg·kg-1,K=2.