自动电位滴定法测定白酒中酸酯总量的不确定度评定
Evaluation of Uncertainty in the Measurement of Total Acid and Ester in Baijiu by Automatic Potentiometric Titration
陈益超 1麻春华 2顾振昆 2田甜 2毛健3
作者信息
- 1. 湘西土家族苗族自治州质量检验及计量检定中心,湖南吉首 416000;粮食发酵与食品生物制造国家工程研究中心(江南大学),江苏无锡 214122
- 2. 湘西土家族苗族自治州质量检验及计量检定中心,湖南吉首 416000
- 3. 粮食发酵与食品生物制造国家工程研究中心(江南大学),江苏无锡 214122
- 折叠
摘要
依据《测量不确定度评定和表示》(JJF 10591.1-2012)和《白酒分析方法》(GB/T 10345-2022),采用自动电位滴定法测定白酒中的酸酯总量,并建立数学模型对白酒测定过程中引入的不确定度进行分析和评定.结果表明,白酒中的酸酯总量为(55.7±0.6)mmol·L-1(k=2);总酸、总酯分别消耗标准滴定溶液的体积所引入的不确定度分量贡献最大,酒样重复性测定和标准滴定溶液浓度所引入的不确定度分量贡献次之,而引入不确定度分量贡献最小的是酒样移取体积.
Abstract
According to JJF 10591.1-2012 and GB/T 10345-2022,the total amount of acid and ester in Baijiu was determined by automatic potentiometric titration,and the uncertainty introduced in the determination of Baijiu was analyzed and evaluated by establishing a mathematical model.The results showed that the total amount of acid and ester in Baijiu was(55.7±0.6)mmol·L-1(k=2).The uncertainty component of total acid and total ester consumed by the volume of standard titration solution contributed the most.The uncertainty components introduced by the repeatability measurement of Baijiu samples and the concentration of standard titration solutions were secondary.The smallest contribution of introducing uncertainty components was the removal volume of Baijiu sample.
关键词
自动电位滴定法/白酒/酸酯总量/不确定度Key words
automatic potentiometric titration/Baijiu/total amount of acid and ester/uncertainty引用本文复制引用
出版年
2024
NETL
NSTL
万方数据