| Project/Area Number |
09480132
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
環境保全
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| Research Institution | Toyohashi University of Technology |
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Principal Investigator |
FUJIE Koichi Toyohashi University of Technology, Department of Ecological Engineering, Professor, 工学部, 教授 (30134836)
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| Co-Investigator(Kenkyū-buntansha) |
GOTO Naohiro Toyohashi University of Technology, Department of Ecological Engineering, Assistant Professor, 工学部, 助手 (50303706)
HU Honh-ying Toyohashi University of Technology, Department of Ecological Engineering, Associate Professor, 工学部, 助教授 (30262976)
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| Project Period (FY) |
1997 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥8,100,000 (Direct Cost: ¥8,100,000)
Fiscal Year 1999: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 1998: ¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1997: ¥4,000,000 (Direct Cost: ¥4,000,000)
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| Keywords | Anionic surfactant / Ion-selective electrode / potentiometric titration method / standard-addition method / water analysis / Foam-separation / 工場排水分析 / 化学センサー / メチレンブルー吸光光度法 / 水質簡易分析 / 環境水 / 水道水 |
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| Research Abstract |
Anionic surfactant is one of the chemicals massively consumed is our daily life and industrial activities. The discharge of anionic surfactants to natural water bodies may cause serious environmental pollution problems because that most of anionic surfactants in waters and wastewaters is required. the absorption photometry using methylene blue is widely used analytical method of anionic surfactants. But there are some problems when using this method. For example, a toxic organic solvent of chloroform is needed in this method and the automatization of operation of this method is difficult. In this study, an ion-selective electrode method for the determination of anionic surfactants, which does not need toxic solvent and is easy for automatization, was developed and successfully applied for the examination of wastewaters and surface waters. The following results and conclusions were obtained in this study.
1) A PVC-membrane type anionic surfactant-selective electrode using a new electro-a
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ctive substance originally synthesized in this study was constructed and the performance of this electrode was experimentally evaluated.
2) A potentiometric titration method for determination of anionic surfactant using the newly developed electrode as an end-point detector was proposed and successfully applied for the examination of domestic and industrial wastewaters with high precision and accuracy. The lower quantitative limit of this method is 5 mg/L.
3) A standard-addition method for the examination of waters with low concentration of anionic surfactants was developed and successfully applied for the examination of river and lake waters without any pre-treatment of samples. The lower and upper quantitative limits of this method are 0.02 m/L and 5 mg/L, respectively.
4) Foam-separation method was introduced for the concentration of anionic surfactants and factors affecting the concentration-efficiently were investigated. By combining with foam-separation, the lower quantitative limits of potentiometric titration and the standard-addition methods for the determination of anionic surfactants were lowered to 0.3 mg/L and 0.001mg/L, respectively. Less
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