کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4485323 1316948 2007 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Photodegradation of sulcotrione in various aquatic environments and toxicity of its photoproducts for some marine micro-organisms
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Photodegradation of sulcotrione in various aquatic environments and toxicity of its photoproducts for some marine micro-organisms
چکیده انگلیسی

Photochemical behaviour of sulcotrione, a triketone herbicide, was studied in a variety of aqueous solutions including natural waters (sea and river) under laboratory conditions. Photodegradation experiments were carried out under two irradiation systems (UV-B and simulated solar radiation) in order to evaluate kinetics of active ingredient. The degradation kinetics, more rapid under UV-B radiation than solar simulator, followed a first-order reaction (photolysis half-lives ranged between 3 and 50 h) and appeared strongly dependent on water origin, pH value and molecular structure of the herbicide. Dissolved organic matter showed a retarding effect while low concentrations of nitrate ions had no effect on photolysis rate. Identification of photoproducts indicated that hydrolysis, a pH-dependent process (no degradation at pH >6 but at pH=3, k=0.0344 h−1), could be photoassisted. These results were compared to those of mesotrione, another triketone herbicide, which appeared more stable under UV-B irradiation.Toxicological studies on two marine heterotrophic bacteria and one cyanobacterium showed absence of effects up to 100 μg L−1 for both sulcotrione and its photoproducts.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Water Research - Volume 41, Issue 8, April 2007, Pages 1781–1789
نویسندگان
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