Development of potentiometric flow titration for nonaqueous solvent system

非水溶剂体系电位流滴定法的研制

• 批准号: 06650935
• 负责人: IMATO Toshihiko
• 金额: $ 1.34万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06650935/
• 关键词: Nonaqueous Solvent; Flow Titration; Potentiometry

The purpose of this project is to develop a potentiometric flow titration method for determination of acid value, alkalinity, saponification value and bromine value of oil sample such as lubricating oil and food oil. Followings are the summary of results of this proiect.A flow system for determination of acid value and alkalinity of oil was designed by using an ethanolic pH buffer solution and a flow-through type pH glass electrode detector. The sensitivity of the detector to acids and bases was found to depend on the ratio of dissociation constants of acid in the sample to that of acid used for the pH buffer solution. Total alkalinity of lubricating oil was successfully determined by the developed method by using the tetrachloroacetate-tetrachloro acetic acid buffer.A flow system for determination of saponification value of oil was designed by using both streams of an ethanol solution of tetrabutylammonium oxide and an ethanolic pH buffer solution and the pH glass electrode detector. The reaction condition of saponification in the flow system was examined with respect to sensitivity for oleic acid ethylester and linoleic acid ethylester. The flow system with a reaction coil of 50 m-long and the temperature of 85ﾟC was optimized The developed method was applied to determination of saponification value of a butter sample and the result was found to be good agreement with that of a conventional titration method.A flow system for determination of bromine value of oil was designed by using a stream of potential buffer consisted of bromide and bromine and a flow-through detector combined a redox electrode with a bromide ion-selective electeode. An optimized condition was established by examining the sensitivity of the detector to unsaturated compounds such as oleic acid ethylester, cyclohexane. The developed method was successfully applied to determination of bromine value of lubricating oil

本课题的目的是研制一种电位流动滴定法，用于测定润滑油、食品油等油样的酸值、碱度、皂化值和溴值。采用乙醇pH缓冲溶液和流通式pH玻璃电极检测器，设计了测定油脂酸价和碱度的流动系统。发现检测器对酸和碱的灵敏度取决于样品中酸的解离常数与用于pH缓冲溶液的酸的解离常数的比率。采用四氯乙酸-四氯乙酸缓冲液成功地测定了润滑油的总碱度，设计了四丁基氧化铵乙醇溶液和乙醇pH缓冲液双液流与pH玻璃电极检测器联用测定润滑油皂化值的流动体系。考察了流动体系中皂化反应条件对油酸乙酯和亚油酸乙酯的灵敏度。优化了反应盘管长度为50 m、反应温度为85 ℃的流动体系，并将其应用于黄油皂化值的测定，结果与常规滴定法一致。设计了以溴离子和溴离子组成的电位缓冲液为流动相，以溴离子为流动相的流动体系测定油脂溴值。通过氧化还原电极和溴离子选择性电极组合的检测器。通过考察检测器对油酸乙酯、环己烷等不饱和化合物的灵敏度，确定了最佳检测条件。该方法已成功应用于润滑油溴值的测定

项目成果

今任稔彦: "緩衝液との反応を利用するフローインジェクション滴定法" Journal of Flow-Injection Analysis. 12. 145-166 (1995)

Toshihiko Imato：“使用缓冲溶液反应的流动注射滴定法”流动注射分析杂志 12. 145-166 (1995)。

H.Ohura, T.Imato, S.Yamasaki and N.Ishibashi: "Potentiometric FIA of chromium (VI) in seawater" Bunseki Kgaku. 43. 31-37 (1994)

H.Ohura、T.Imato、S.Yamasaki 和 N.Ishibashi：“海水中铬 (VI) 的电位 FIA”Bunseki Kgaku。

大浦博樹: "フローインジェクション電位差分析法による海水中クロム(И)の定量" 分析化学. 43. 31-37 (1994)

Hiroki Oura：“通过流动注射电位分析测定海水中的铬 (И)”《分析化学》43. 31-37 (1994)。

大浦博樹: "フローインジェクション電位差分析法による海水中クロム(V)の定量" 分析化学. 43. 31-37 (1994)

Hiroki Oura：“通过流动注射电位分析测定海水中的铬 (V)”，《分析化学》43. 31-37 (1994)。

今任稔彦: "界面活性剤分離分析技術第3章" 技術情報協会, 33 (1994)

今藤俊彦：《表面活性剂分离与分析技术第3章》技术情报协会，33（1994）