分光光度比色法测定肉丸中硼酸的不确定度评定

Evaluation of Uncertainty in Determination of Boric Acid in Meatballs by Spectrophotometry Colorimetry

采用分光光度比色法测定肉丸中的硼酸含量,根据GUM方法程序对测定过程中的不确定度进行评定,并计算合成与扩展不确定度。结果表明,肉丸中硼酸含量为79.48 mg·kg^(-1)时,扩展不确定度为4.28 mg·kg^(-1)(k=2);测定过程中标准曲线拟合、测量重复性与硼酸标准溶液赋值引入的不确定度对测量结果的影响较大。

The boric acid content in meatballs was determined by spectrophotometric colorimetric method.The uncertainty in the determination process was evaluated according to GUM procedure,and the synthetic and extended uncertainty were calculated.The results showed that when the content of boric acid in meatball was 79.48 mg·kg^(-1),the expanded uncertainty was 4.28 mg·kg^(-1)(k=2).The uncertainty introduced by standard curve fitting,measurement repeatability and assignment of boric acid standard solution during the determination process had a great impact on the measurement results.