Quantum Yields of the Photodegradation of 1, 2, 3, 4-, 1, 3, 6, 8-, and 2, 3, 7, 8-Tetrachlorodibenzo-<i>p</i>-dioxins and their Half-life Periods
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- KOSHIOKA Masaji
- National Institute of Agro-Environmental Sciences
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- ISHIZAKA Masumi
- National Institute of Agro-Environmental Sciences
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- YAMADA Tadao
- National Institute of Agro-Environmental Sciences
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- KANAZAWA Jun
- National Institute of Agro-Environmental Sciences
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- MURAI Toshinobu
- National Institute of Agro-Environmental Sciences
Bibliographic Information
- Other Title
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- テトラクロロダイオキシン (TCDD) 類の光分解における量子収量と半減期
- テトラクロロダイオキシン(TCDD)類の光分解における量子収量と半減期〔英文〕
- テトラクロロダイオキシン TCDD ルイ ノ ヒカリ ブンカイ ニ オケル リ
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Abstract
Photodegradation of three tetrachlorodibenzo-p-dioxins (TCDDs), 1, 2, 3, 4-TCDD, 1, 3, 6, 8-TCDD, and 2, 3, 7, 8-TCDD, in dioxane solution was investigated under xenon lamp irradiation. The quantum yields (φλ) for direct photodegradation of these TCDDs were 1.009×10-3, 2.798×10-3, and 1.990×10-2mol·einstein-1, respectively, at 313nm, which is a wavelength usually used in determining the quantum yield of a test compound. However, the quantum yields of these TCDDs at wavelengths of the maximal photodegradation peak at more than 295nm were 2.133×10-3, 3.020×10-3, and 3.283×10-2, respectively, at their maximal photodegradation peaks, and were higher than those at 313nm. Based on these quantum yields and the measured absorption spectra together with the solar intensity data available in the literature, we estimated the direct sunlight first-order photodegradation rate constants of these TCDDs under conditions of variable sunlight intensities on the surface of water bodies during various seasons at 40°N latitude. Also determined were the corresponding half-life times.
Journal
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- Journal of Pesticide Science
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Journal of Pesticide Science 15 (1), 39-45, 1990
Pesticide Science Society of Japan
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Details 詳細情報について
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- CRID
- 1390282680185895552
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- NII Article ID
- 110001712321
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- NII Book ID
- AN00196227
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- ISSN
- 03851559
- 13490923
- 1348589X
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- NDL BIB ID
- 3656660
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- Data Source
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- JaLC
- IRDB
- NDL
- Crossref
- NDL-Digital
- CiNii Articles
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- Abstract License Flag
- Disallowed