Metabolism of uniconazole-P in water-sediment systems under illumination.
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.
Kodaka
Rika
R
Sumitomo Chemical, Environmental Health Science Laboratory, 2-1, Takatsukasa 4-chome, Takarazuka 665-8555, Japan. kodaka@sc.sumitomo-chem.co.jp
Sugano
Terumi
T
Katagi
Toshiyuki
T
D019015:Geologic Sediments; D006207:Half-Life; D007700:Kinetics; D008027:Light; D010777:Photochemistry; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000378:metabolism*; D014230:Triazoles / Q000737:chemistry / Q000378:metabolism*; D014867:Water / Q000737:chemistry
D012989:Soil Pollutants; D014230:Triazoles; D014867:Water; C511205:uniconazole-P; C092705:uniconazole