食品科学 ›› 2010, Vol. 31 ›› Issue (4): 206-209.doi: 10.7506/spkx1002-6300-201004047

• 分析检测 • 上一篇    下一篇

分光光度法测定食品中二氧化钛的不确定度评定

陆美斌,王步军   

  1. 中国农业科学院作物科学研究所,农业部谷物品质监督检验测试中心
  • 收稿日期:2009-06-03 修回日期:2009-11-05 出版日期:2010-02-15 发布日期:2010-12-29
  • 通讯作者: 陆美斌 E-mail:lumeibin2005@yahoo.com.cn

Evaluation of Uncertainty in Spectrophotometric Determination of Titanium Dioxide in Foodstuffs

LU Mei-bin,WANG Bu-jun   

  1. Institute of Crop Science, Chinese Academy of Agricultural Sciences, Supervision and Testing Center of Cereal Quality,
    Ministry of Agriculture, Beijing 100081, China
  • Received:2009-06-03 Revised:2009-11-05 Online:2010-02-15 Published:2010-12-29
  • Contact: LU Mei-bin E-mail:lumeibin2005@yahoo.com.cn

摘要:

通过分析食品中二氧化钛的测定过程,确定各个不确定度来源,建立不确定度评定数学模型,对单个不确定度分量进行合成和扩展,最终建立食品中二氧化钛测定的不确定度评定方法。结果表明:二氧化钛含量为(122.48 ± 4.63)mg/kg,K=2;本实验方法测量不确定度的主要来源为4 个方面,按引入的不确定度分量贡献大小排序,依次为测量重复性、溶液测定、样品定容、称样量。本评定方法适用于一般情况下的分光光度、原子荧光、原子吸收、气相色谱、液相色谱等仪器的测量不确定度评定。

关键词: 分光光度法, 二氧化钛, 不确定度

Abstract:

The source of uncertainty in the spectrophotometric determination of titanium dioxide in foodstuffs were investigated by analyzing the whole determination procedure. Each uncertainty component was modelled, synthesized and expanded to develop a method for the evaluation of uncertainty in spectrophotometric determination of titanium dioxide in foodstuffs. Results showed that the titanium dioxide content in a commercial flour was determined to be (122.48 ± 4.63) mg/kg, K = 2. The main uncertainties were attributed to four sources, namely measurement repeatability, solution determination, sample dilution and sampling in decreasing order of uncertainty contribution. This method is applicable to the evaluation of uncertainty in routine determinations by spectrophotometry, atomic fluorescence spectroscopy (AFS), atomic absorption spectroscopy (AAS), gas chromatography (GC), liquid chromatography (LC), and so on.

Key words: spectrophotometry, titanium dioxide, uncertainty

中图分类号: