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Photodegradation of herbicide metamifop in aqueous solution
제초제 metamifop의 수중 광분해

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Authors
이호주
Advisor
김정한
Issue Date
2003
Publisher
서울대학교 대학원
Keywords
MetamifopPhotolysisDirect photolysisIndirect photolysisAcetoneUV-AUV-BUV-CPhotoproducts
Description
Thesis (master`s)--서울대학교 대학원 :농생명공학부,2003.
Abstract
This work is a laboratory study of the abiotic degradation by photolysis
of metamifop in aqueous solution. In direct photolysis, half-life of
metamifop, (R)-2-[4-(6-chloro-1,3-benzoxalzol-2-yloxy)phenoxy]-N-
(2-fluorophenyl)-N-methyl propionamide, was 248 days and quantum
yield was 1.10×10-5 under sunlight.
In indirect photolysis, degradation of metamifop was enhanced by
chemical sensitizer. Half-life of metamifop were 128 days for synthetic
humic water, 122 days for paddy water, and 18.8 days for acetonecontaining
water under sunlight.
Photodegradation of metamifop was increased greatly under UV-B
(312nm) and C (254nm) lamp, but UV-A (365nm) was not affected to
its degradation. In aqueous acetonitrile solution, half-life were 63.6 and
29.6 min under UV-B and C, respectively. In acetonitrile solution, halflife
were 43.9 and 20.5 min under UV-B and C, respectively. In
methanol solution, half-life were 38.7 and 18.8 min under UV-B and C,
repectively. In order to investigate metabolites, highly concentrated
solution (250ppm, in acetonitrile) was irradiated under UV-C, and then
7 metabolites were identified as 4-(6-chloro-benzooxazol-2-yloxy)-phenol, N-(2-Fluoro-phenyl)-2-hydroxy-N-methyl-propionamide, N-(2-
Fluoro-phenyl)-2-(4-hydroxy-phenoxy)-N-methyl-propionamide, 3HBenzooxazol-
2-one, 2-[4-(Benzooxazol-2-yloxy)-phenoxy]-N-(2-
fluoro-phenyl)-N-methyl-propionamide, 6-chloro-3H-benzooxazol-2-
one.
Key words : Metamifop, photolysis, direct photolysis, indirect
photolysis, acetone, UV-A, UV-B, UV-C, photoproducts
Language
English
URI
http://dcollection.snu.ac.kr:80/jsp/common/DcLoOrgPer.jsp?sItemId=000000058960

https://hdl.handle.net/10371/67519
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College of Agriculture and Life Sciences (농업생명과학대학)Dept. of Food and Animal Biotechnology (식품·동물생명공학부)Theses (Master's Degree_식품·동물생명공학부)
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