| Project/Area Number |
15600004
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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 |
水循環システム
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| Research Institution | Kyoto Prefectural University |
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Principal Investigator |
YONEBAYASHI Koyo Kyoto Prefectural University, Graduate School of Agriculture, Professor, 農学研究科, 教授 (00046492)
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| Co-Investigator(Kenkyū-buntansha) |
KODAMA Hiroki Kyoto Prefectural University, Graduate School of Agriculture, Research Assistant, 農学研究科, 助手 (60305563)
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| Project Period (FY) |
2003 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 2004: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2003: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | trihalomethane / humic substances / non-humic substances / fulvic acd / chloroform / DAX-8 resin |
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| Research Abstract |
Trihalomethane(THM) which exists in tap water is thought to be formed from aquatic humic substances(HS) as a precursor during water treatment with chlorine. However, few studies about the relationship between aquatic HS and the THM formation potential in environmental water have been reported. HS are refractory organic substances in environment chemically or biologically synthesized from decayed plant tissues and their decomposition product. On the other hand, natural water contains non-humic substances (non-HS) which belong to known classes of biochemistry. They probably contain most of the biochemical compounds synthesized by living organisms. Non-HS are handled as a mixture because their chemical specifications are difficult. Chlorination of non-HS is more suitable for the formation of THM than the chlorination of HS which are refractory. The purpose of this study is to estimate the contribution of HS against the THM formation potential using the HS isolated from natural water.
Water
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samples were collected from Kizu, Uji, Katsura, and Yodo River, and separated into 4 fractions ; that are hydrophobic acid (HS), hydrophobic neutral, and hydrophilic fraction, with a column of DAX-8 resin. A chlorination was performed for natural water samples and each fractions under the condition to estimate the THM formation potential. The concentrations of THMs in headspace of reaction bottle contained chlorine-treated water sample were determined by GC-MS.
The fulvic acd(FA) was major part of aquatic HS and most of the THM made by chlorination of natural water was chloroform. Chloroform formation potential of investigated natural water was 13-22 μg/L. The contribution of FA was 15-24% as a result of comparing THM formation potentials between the FA and original water. The existence of FA in natural water was 13-28%. Therefore, the main precursor of THMs made by chlorination of natural water is non-HS. Hydrophilic acid of the non-HS would take the greater part of the precursor of THMs. Less
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