Effects of light regime and oxygen profile on transformation of oxolinic acid in pond sediment.
This study investigated the effects of light (visible light - 5800 lux, 24h) or dark regime and aerobic or anaerobic condition on the decay of added oxolinic acid (OA) at 5, 10 and 20 mg L(-1) in eel pond sediment. An asymptotic decaying exponential model C(t)=C(min)+C(o) × exp (-k × t) was used to facilitate quantitative approach to OA transformation, where C(t) is the concentration of OA after t days, C(min) the estimated level-off concentration of OA residue, C(o) the concentration of added OA and k the decaying coefficient. OA decayed faster under light (C(min)=4.6 mg L(-1)) than under dark (C(min)=7.8 mg L(-1)) and also decayed faster under aerobic (C(min)=4.0 mg L(-1)) than under anaerobic condition (C(min)=8.5 mg L(-1)). C(min) increased with C(o). Sundrying and tilling eel pond bottom should be able to reduce OA residue significantly.
Department of Aquatic Biosciences, National Chiayi University, 300 University Rd., Chiayi 60004, Taiwan, ROC.
Hong-Thih
HT
Lai
Juo-Shan
JS
Lin
Yew-Hu
YH
Chien
D000693:Anaerobiosis / Q000187:drug effects / Q000528:radiation effects; D000818:Animals; D001711:Biotransformation / Q000187:drug effects / Q000528:radiation effects; D005618:Fresh Water; D019015:Geologic Sediments / Q000737:chemistry*; D007753:Laboratories; D008027:Light; D008956:Models, Chemical; D010093:Oxolinic Acid / Q000378:metabolism*; D010100:Oxygen / Q000494:pharmacology*
D010093:Oxolinic Acid; D010100:Oxygen