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Metabolism of uniconazole‐P in water‐sediment systems under illumination
Author(s) -
Kodaka Rika,
Sugano Terumi,
Katagi Toshiyuki
Publication year - 2006
Publication title -
environmental toxicology and chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 171
eISSN - 1552-8618
pISSN - 0730-7268
DOI - 10.1897/05-116ra.1
Subject(s) - sediment , chemistry , photodegradation , isomerization , environmental chemistry , metabolism , aquatic ecosystem , photochemistry , degradation (telecommunications) , photocatalysis , organic chemistry , biology , biochemistry , catalysis , paleontology , telecommunications , computer science
Aerobic soil metabolism of uniconazole‐P ([ S ]‐ E ‐1‐[4‐chlorophenyl]‐4,4‐dimethyl‐2‐[1,2,4‐triazole‐1‐yl]‐penten‐3‐ol) and the effect of illumination on metabolic profiles were studied in the water–sediment system when spiked to water. Uniconazole‐P was gradually partitioned to the sediment with an aquatic half‐life of 6.9 d in darkness with formation of bound residues. Illumination of the system from a xenon lamp (>290 nm) greatly accelerated the degradation of uniconazole‐P via photoinduced isomerization between E‐ and Z‐isomers with a subsequent intramolecular cyclization, and its aquatic half‐life was greatly reduced to 0.6 d. Kinetic analysis based on compartment models suggested the possible contribution of photodegradation at the water‐sediment interface, leading to more formation of the cyclized derivative in the sediment.