| Project/Area Number |
06650935
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
工業分析化学
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
IMATO Toshihiko Kyushu University, Faculty of Engineering, Professor, 工学部, 教授 (50117066)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1995: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1994: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | Nonaqueous Solvent / Flow Titration / Potentiometry |
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| Research Abstract |
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
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