مشخصات پژوهش

عنوان	Atmospheric Hydroxyl Radical Reaction Rate Coefficient and Total Environmental Lifetime of α‑Endosulfan
نوع پژوهش	مقاله چاپ‌شده در مجلات علمی
کلیدواژه‌ها	hydroxyl radical, reaction kinetics, organochlorine pesticide, persistent organic pollutant, multicompartmental distribution
چکیده	Endosulfan is a semivolatile organochlorine pesticide that was globally distributed before it was banned, and it continues to cycle in the Earth system. The chemical kinetics of the reaction of α-endosulfan with the hydroxyl radical (OH) was studied by means of pulsed vacuum UV flash photolysis and time resolved resonance fluorescence (FP-RF) as a function of temperature in the range of 348–395 K. The experimentally determined rate coefficient, kOH = 5.8×10-11 exp (-1960 K/T) cm3 s-1 (uncertainty range 7×10-12 exp (-1210 K/T) to 4×10-10 exp (-2710 K/T) cm3 s-1) suggests photochemical atmospheric half-lives ranging from 2-6 months (assuming a temperature of 298 K and an OH concentration of 1 ×10-6 cm-3). Comparing the atmospheric concentrations observed after the global ban of endosulfan with multimedia model predictions, we conclude that photochemical degradation in the atmosphere is slower than biodegradation in soil. Lifetimes in soil or water must be underestimated, in particular in temperate and warm climate.
پژوهشگران	اولریچ پوشل (نفر ششم به بعد)، کورنلیوس زتچ (نفر پنجم)، گرهارد لمل (نفر چهارم)، محسن پادروند (نفر سوم)، زوران کیتانوسکی (نفر دوم)، پائولو آلارکون (نفر اول)