火焰原子吸收光谱法测定葡萄酒中铁的不确定度评定

目的评定火焰原子吸收法测定葡萄酒中铁的不确定度。方法根据GB/T 15038-2006《葡萄酒、果酒通用分析方法》,建立测定葡萄酒中铁含量的不确定度的数学模型。结果该方法测定葡萄酒中铁含量为3.806 mg/L的扩展不确定度为0.376 mg/L。结论不确定度主要来源为标准溶液配制和工作曲线拟合。

Uncertainty evaluation for the determination of iron in grape wine by atomic absorption spectrometry

ABSTRACT: Objective To establish the analytical method of uncertainty of iron content in grape wine sample by atomic absorption spectrometry (AAS) for evaluating the reliability of the detection results. Methods According to GB/T 15038-2006, a mathematical model for the uncertainty of iron content in wine was established. Results According to the Method, when the iron content in grape wine was 3.806 mg/L, the expanded uncertainty of iron content in grape wine was 0.376 mg/L.The results revealed that the main origin of uncertainty was caused by preparing standard solution and drawing the working curve. Conclusion This method is suitable to evaluate the uncertainty of iron content in grape wine.