日用化学工业2012，Vol.42Issue(2)：141-145,153,6.
自动电位滴定法定量测定烷基羧基甜菜碱类表面活性剂含量
Quantitative determination of alkylcarboxylbetaine surfactants by automatic potentiometric titration
王海江 1戚晶晶 1许宗会 1郑昌戈 1崔正刚1
作者信息
- 1. 江南大学化学与材料工程学院,江苏 无锡214122
- 折叠
摘要
Abstract
Quantitative determination of a series of alkylcarboxylbetaines by automatic potentiometric titration was studied with emphases as effect of selection of acidification agents, acidification temperature and time on the titralion result with respect to the content of alkylcarboxylbetaines. The results showed that the determination accuracy is significantly affected by the pH of the acidification system as well as the acidification temperature and time. Key issue is to assure the complete acidification of the alkylcarboxylbetaine molecules. By using acetic acid - sodium acetate buffer solution of pH = 3 as acidification system at 70 ～ 80 ℃ for 2 -3 h,the content of C12 - C18 alkyldimethylcarboxylbetaines and bis - dodecylmethylcarboxylbetaine can be potentiometric titrated by sodium dodecyl sulfate (SDS) with satisfactory result and the recovery achieves 97% - 102%. Good results have also be obtained by acidification in sulfuric acid solution of pH = 2 for 1 h at room temperature. For samples of technical grade betaine product, under the titration conditions, content of tertiary amine in the product will participate the titration reaction,so that the titration result is actually the sum of content of alkylbetaine and corresponding tertiary amine. Since the tertiary amine content can be independently measured using suitable method,the content of alkylbetaine can thus be quantitatively identified. 关键词
烷基羧基甜菜碱/自动电位滴定/酸化/定量分析Key words
alkylcarboxylbetaine/ automatic potentiometric titration/ acidification/ quantitative analysis分类
化学工程引用本文复制引用
王海江,戚晶晶,许宗会,郑昌戈,崔正刚..自动电位滴定法定量测定烷基羧基甜菜碱类表面活性剂含量[J].日用化学工业,2012,42(2):141-145,153,6.
