葡萄酒中铁含量测试结果的不确定度评定

Evaluation of the uncertainty for determination results of iron in grape wine

按照国家标准GB/T 15038-2006《葡萄酒、果酒通用分析方法》对2支葡萄酒样品中的铁含量进行了测定,对整个测量过程的不确定度来源进行了分析,并对不确定度各个分量进行了评定和合成。结果显示,火焰原子吸收光谱法测定葡萄酒中铁含量的不确定度来源主要为标准溶液配制引入的不确定度和工作曲线拟合引入的不确定度。采用本方法测定的两支葡萄酒样品中铁含量的扩展不确定度分别为0.14、0.15mg/L。

The content of iron in two wine samples was measured according to national standards GB/T 15038-2006 Common Analytic Methods for Grape Wine ＆ Fruit Wine.The uncertainty source in the whole measuring process was analyzed and each uncertainty component was evaluated and composed.The results revealed that the major source of uncertainty was the preparing of standard solution and the curve fitting and measurement.According to this method,the expanded uncertainty of iron content in two wine samples were 0.14mg/L and 0.15mg/L.