| Project/Area Number |
09640579
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
地球化学
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| Research Institution | TOKYO UNIVERSITY OF AGRICULTURE AND TECHNOLOGY |
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Principal Investigator |
TAKADA Hideshige TOKYO UNIVERSITY OF AGRICULTURE AND TECHNOLOGY,FACULTY OF AGRICULTURE,ASSOCIATE PROFESSOR, 農学部, 助教授 (70187970)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1997: ¥2,300,000 (Direct Cost: ¥2,300,000)
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| Keywords | molecular markers / synthetic detergent / optical brightener / anthropogenic compounds / coastal environment / sediment core / estuary / geochronometer / 人為配源化合物 / 指標化合物 / 幾向異性体 / 光化学反応 / 蛍光増白剤 / Molecular marker / スチルベン |
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| Research Abstract |
Sensitive analytical method of fluorescent whitening agents (FWAs) using HPLC with fluorescent detector have reveled the distributions and behaviors two stilbene-type FWAs (DSBP and DAS 1) in Tokyo Bay and adjacent aquatic environments. Monitoring of wastewater influents and effluents indicates that approximately 60 % of DSBP and 80 % of DAS 1 are removed during primary and secondary treatments. These removal efficiencies are less than those for the other water-soluble molecular markers (e.g. LAS, > 95%), suggesting that FWAs are better markers of wastewater effluents. Comparison of their concentrations in the effluents and quantitation limits gives theoretical maximum detectable dilution of - 10^4S.Removal of FWAs in estuary where many chemical constituents are removed has been studied in the Tamagawa Estuary. Salinity vs. FWAs concentration diagram demonstrated that FWAs, especially DAS 1 behave conservatively in the estuary. Removal of FWAs in the estuary is calculated at 3 % for DAS 1 and 40 % for DSBP based on the mixing diagram. These removals are much less than that for LAS.These poor removals are consistent with the finding that FWAs are widely distributed in Tokyo Bay water with their concentrations ranging from 0.005 mug/L to 4 mug/L.The present results demonstrated that FWAs are potentially powerful molecular markers in tracking wastewater effluents in coastal zones. In addition to their concentrations, the relative abundance (i.e. DSBP/DAS1 ratio) could be indicator of history of water mass. FWAs have been analyzed for a sediment core sample from Tokyo Bay. Their vertical distributions are consistent with the production history of both compounds, demonstrating the usefulness of FWAs as geochronometers.
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