收藏我们   ENGLISH  
论文查询
范围:  
提 交
《化学分析计量》 2020年第06期
DOI:10.3969/j.issn.1008-6145.2020.06.030
分光光度法测定饲料中尿素不确定度评定
李丽蓓1,王石1,朱靖蓉2,樊霞1
1.中国农业科学院农业质量标准与检测技术研究所,北京 100081; 2.新疆农业科学院农业质量与检测技术研究所,乌鲁木齐 830091 
Uncertainty evaluation for the determination of urea in feed by spectrophotometry
李丽蓓1,王石1,朱靖蓉2,樊霞1
1. Institute of Quality Standards &Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, Beijing 100081, China; 2. Research Institute of Quality Standards &Testing Technology for Agro-products, Xinjiang Academy of Agricultural Sciences, Urumqi 830091, China 
摘要:基于对二甲氨基苯甲醛分光光度法(GB/T 36859-2018)测定饲料中尿素含量,对测定结果的不确定度进行评定。根据国家计量技术规范JJF 1059.1-2012 《测量不确定度评定与表示》的要求,以检测原理为基础建立数学模型,分析测定过程中引入的各项不确定度,计算合成标准不确定度和扩展不确定度。当饲料中尿素含量为0.98%时,扩展不确定度为0.082%(k=2)。该检测方法的不确定度主要来源于标准工作曲线拟合引入的不确定度,其次为测量重复性和系列标准工作溶液配制所引入的不确定度。  
Abstract:The content of urea in feed was determined based on p-dimethylaminobenzaldehyde spectrophotometry (GB/T 36859-2018). The uncertainty of measurement results was evaluated. According to evaluation and expression of uncertainty in measurement(JJF 1059.1-2012), a mathematical model was established based on the detection principle. The various components of uncertainty in the measuring process of determining of urea content in feed were analyzed, and the combined uncertainty and extended uncertainty were calculated. The expanded uncertainty was 0.082%(k=2) as urea content in the feed sample was 0.98%. The major factor of uncertainty in measurement of this method is the standard curve fitting, and the minor ones are the repeatability of measurement and the preparation of urea standard solution.  
关键词:不确定度,尿素,对二甲氨基苯甲醛,分光光度法,饲料 
Keywords:uncertainty; urea; p-dimethylaminobenzaldehyde; spectrophotometry; feed 
基金:国家标准计划项目(20154095–T–326)资助 
本文引用格式:
李丽蓓,王石,朱靖蓉,等.分光光度法测定饲料中尿素不确定度评定[J].化学分析计量,2020,29(6):130-135.
LI L B,WANG S,ZHU J R,et al. Uncertainty evaluation for the determination of urea in feed by spectrophotometric[J]. Chemical analysis and meterage,2020,29(6):130-135. 

全文:
《化学分析计量》杂志社 版权所有,未经授权禁止复制或者建立镜像
地址:山东省济南市天桥区田庄东路3号 邮编:250031
电话:0531-85878132 85878224 85878278
鲁ICP备05018524号-6