1995 Fiscal Year Final Research Report Summary
The Effect of the Components of Surfactant on the Biodegradation in River and Sediment of Micropolutants
| Project/Area Number |
06680538
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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 |
環境保全
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
YAMADA Harumi Kyoto Univ., Fac.of Eng.Instructor, 工学部, 助手 (40089123)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUI Saburo Kyoto Univ., Fac.of Eng.Prof., 工学部, 教授 (90092808)
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| Project Period (FY) |
1994 – 1995
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| Keywords | Organophosphoric acid triesters / Surfactant / Biodegradation / Sodium dodecylbenzenesulfonate |
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| Research Abstract |
Organophosphoric acids triesters (OPEs) are widely used as plastic additives and the order of a few mug/L of OPEs are actually detected in river water. They are recalcitrants, .
In this research, OPEs such as TBP (Tributyl phosphate), TBXP (Tris (2-butoxyethyl) phosphate) and TCEP (Tris (2-chloroethyl) phosphate) were used as model compounds of micropolutants. Sodium dodecylbenzenesulfonate (DBS,a kind of LAS) was used as a surfactant. The effect of concentration of DBS on the biodegradation in river of OPEs was investigated. The effect of solvent on extraction efficiency of liquid-liquid extraction of OPEs in the condition which DBS coexisted was also investigated. Hexane, benzene and dichloromethane were used as extraction solvent. The results obtained are as follows ;
1. The effect of extraction solvent
1) In the condition which DBS coexists under 10 mg/L,dichloromethane has the best extraction efficiency. 2) In the condition at DBS above 100 mg/L,the extraction efficiency of dichloromethane is lower. 3) In the extraction of TCEP by hexane, the extraction efficiency increases as DBS increases. 4) The extraction by benzene is not affected the concentration of DBS.
2. The effect of the component of surfactant on the biodegradation of OPEs
The concentration of OPE used was 1 mg/L,and DBS was 0,3,10 and 100mg/L.
1) In the condition at the concentration of DBS above 100mg/L,any of OPEs investigated was not biodegraded. 2) For TBP,the initiation time of biodegradation delayd as DBS increased.3) For TBXP,there was no difference on the initiation time of biodegradation by the concentration of DBS.4) TCEP was not biodegraded in spite of DBS coexists or not.
It is concluded that in the condition which DBP coexists above 100 mg/l, OPEs are not biodegraded and the initiation time of biodegradation of some of OPEs are affected by the concentration of DBS.
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