食品科学 ›› 2013, Vol. 34 ›› Issue (6): 208-210.doi: 10.7506/spkx1002-6630-201306046

• 分析检测 • 上一篇    下一篇

分光光度法测定白菜中亚硝酸盐的不确定度评定

郝晓莉1,赵瑛博2,*,陈芳芳1   

  1. 1.辽宁省农业科学院开放实验室,辽宁 沈阳 110161;2.沈阳农业大学分析测试中心,辽宁 沈阳 110866
  • 收稿日期:2011-11-28 修回日期:2013-01-22 出版日期:2013-03-25 发布日期:2013-03-01
  • 通讯作者: 赵瑛博 E-mail:yb_zhao1979@163.com
  • 基金资助:
    辽宁省农产品质量安全检测与控制技术研究

Evaluation of Uncertainty in Spectrophotometric Determination of Nitrite in Chinese Cabbage

HAO Xiao-li1,ZHAO Ying-bo2,*,CHEN Fang-fang1   

  1. 1. Open Laboratory of Liaoning Academy of Agricultural Sciences, Shenyang 110161, China;2. Analysis and Testing Center, Shenyang Agricultural University, Shenyang 110866, China
  • Received:2011-11-28 Revised:2013-01-22 Online:2013-03-25 Published:2013-03-01

摘要: 通过对分光光度法测白菜中亚硝酸盐的含量测定过程的研究,确定测定结果的不确定度。建立不确定度的数学模型,对各不确定度分量进行合成和扩展,最终建立白菜中亚硝酸盐含量的不确定度评定方法。影响测量结果不确定度的因素共有4项,按其影响大小顺序排列分别为测量重复性、标准曲线法测定样液中亚硝酸酸盐质量、溶液定容以及试样称量。其不确定度报告为白菜中亚硝酸盐含量(12.3±1.08)mg/kg,包含因子k=2。

关键词: 亚硝酸盐, 不确定度, 分光光度法

Abstract: The sources of uncertainty in the spectrophotometric determination of nitrite in Chinese cabbage were investigated by analyzing whole determination procedure. Each uncertainty component was modeled, synthesized and developed a method for the evaluation of uncertainty in spectrophotometric determination of nitrite in Chinese cabbage. The uncertainty was attributed to four sources. The order of their impacts was measurement repeatability, nitrite mass determined by standard curve, sample dilution and sample weighting. The results of uncertainty evaluation showed the nitrite content to be (12.3 ± 1.08) mg/kg (k = 2).

Key words: nitrite, uncertainty, spectrophotometry

中图分类号: