Effects of photoirradiation on the characteristics of dissolved organic matter in Lake Biwa and its surrounding rivers.
-
- Yamada Etsu
- Center for Environmental Science, Kyoto Institute of Technology Department of Chemistry and Material Technology, Kyoto Institute of Technology
-
- Ueda Tomoya
- Department of Chemistry and Material Technology, Kyoto Institute of Technology
-
- Tanaka Toshiyuki
- Department of Chemistry and Material Technology, Kyoto Institute of Technology
-
- Fujii Kazuki
- Department of Chemistry and Material Technology, Kyoto Institute of Technology
-
- Mizuguchi Hirotaka
- Department of Chemistry and Material Technology, Kyoto Institute of Technology
-
- Fuse Yasuro
- Center for Environmental Science, Kyoto Institute of Technology Department of Chemistry and Material Technology, Kyoto Institute of Technology
書誌事項
- タイトル別名
-
- <b>Effects of photoirradiation on the characteristics of dissolved organic matter in Lake Biwa and its surrounding rivers </b>
説明
<p>The effects of photoirradiation on changes in the fluorescence intensities, dissolved organic carbon (DOC) concentrations, and molecular weights of dissolved organic matter (DOM) in Lake Biwa and its surrounding rivers were evaluated and compared with the results of humic substances and algal DOM. During the completely stratified period (summer), the fluorescence intensities of fulvic-like fluorophores in the surface water in the northern basin of Lake Biwa decreased and were lower than those in other months and in bottom water. The fluorescence quenching and degradation of high-molecular substances by further solar irradiation were hardly observed in the surface water samples but were significantly observed in bottom water samples. On the other hand, changes in the DOC concentrations in all samples were relatively small with solar irradiation. These results suggest that in the northern basin of Lake Biwa, the susceptibility of fulvic-like fluorophores to degradation by further solar irradiation is dependent on the water depth collected during the stratified period (summer), but the rest of fulvic-like fluorophores might be resistant to further photochemical degradation regardless of the water depth.</p><p>Furthermore, the effects of the wavelength region on the characteristics of DOM and fluorophores in Lake Biwa and its surrounding rivers were examined by Xe lamp irradiation using two kinds of wavelength cut filters. From these results, it is considered that wavelengths between 290 and 495 nm and below 290 nm might largely affect the characteristics of fulvic-like fluorophores and protein-like fluorophores, respectively.</p>
収録刊行物
-
- 環境と安全
-
環境と安全 9 (2), 23-32, 2018
大学等環境安全協議会
- Tweet
キーワード
詳細情報 詳細情報について
-
- CRID
- 1390564237999045504
-
- NII論文ID
- 130007402113
-
- ISSN
- 21863725
- 18844375
-
- 本文言語コード
- en
-
- 資料種別
- journal article
-
- データソース種別
-
- JaLC
- CiNii Articles
- KAKEN
- Crossref
-
- 抄録ライセンスフラグ
- 使用不可
