电感耦合等离子体发射光谱法测定油条中铝含量的不确定度评定

Evaluation of uncertainty in determination of aluminum in deep-fried dough sticks by inductively coupled plasma-optical emission spectrometery

目的评定电感耦合等离子体发射光谱法(inductively coupled plasma-optical emission spectrometery,ICP-OES)检测油条中铝含量的不确定度。方法根据测量不确定度的评定原理和方法,建立测量不确定度数学模型,进行分量计算,确定不确定值,对测量结果的不确定度进行评定。结果油条中铝元素测定结果为12.65 mg/kg,扩展不确定度为0.53 mg/kg(k=2,P=95%)。结论测定过程不确定度主要来源于标准曲线拟合、重复性测定、回收率。

Objective To evaluate the uncertainty for the determination of aluminum in deep-fried dough sticks by inductively coupled plasma-optical emission spectrometery(ICP-OES).Methods According to the evaluation principle and measurement method based on measurement uncertainty,the mathematical model of uncertainty in measurement was established,component calculation was conducted,and then uncertainty was determined.The uncertainty of measurement results was evaluated.Results The results of determination of aluminum in deep-fried dough sticks were 12.65 mg/kg,The expanded uncertainty was 0.53 mg/kg(k=2,P=95%).Conclusion The uncertainty of determination process mainly comes from the fitting of standard curve,repeatability test and the rate of recovery.