分析测试学报2011，Vol.30Issue(5)：566-569,4.DOI:10.3969/j.issn.1004-4957.2011.05.018
平头pH电极-流动注射联用技术快速滴定食醋中醋酸的方法研究
Determination of Acetic Acid Content in Vinegar by pH Electrode and Flow Injection Analysis
摘要
Abstract
A new flow injection analysis(FIA) system with a flat pH electrode was established for the rapid determination of acetic acid in vinegar. The FIA system was optimized by alteration of injection volume, flow rate, carrier concentration and length of reaction tubes. With sodium hydroxide solution as carier stream, the peak area obtained from the lab assembled FIA system were proportional to the logarithm concentration of acetic acid in the range of 4. 639 × 10-4 -0. 212 mol · L-1. The method was applied in the detection of acetic acid in four vinegar samples, and the results obtained were in good agreement with those obtained by the standard manual titration method. The sensitivity of this method was ten times higher than that of the conventional titration method, and the analysis rate was up to 60 samples per hour. By changing the concentration of carrier stream ( sodium hydroxide), the acetic acids at different concentration levels can be titrated without any other adjustments to the FIA system.关键词
pH电极/流动注射分析/滴定/醋酸Key words
pH electrode/ flow injection analysis/ titration/ acetic acid分类
化学化工引用本文复制引用
张伯先,康秀英,孙杨,宋启军..平头pH电极-流动注射联用技术快速滴定食醋中醋酸的方法研究[J].分析测试学报,2011,30(5):566-569,4.基金项目
国家自然科学基金资助项目(20977042) （20977042）
江苏省科技支撑计划资助项目(201007) （201007）
