کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6332920 1619798 2013 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Direct and indirect photodegradation of estriol in the presence of humic acid, nitrate and iron complexes in water solutions
ترجمه فارسی عنوان
فتوسنتزی مستقیم و غیر مستقیم از استریول در حضور اسید هومیک اسید، نیترات و آهن در محلول های آب
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
چکیده انگلیسی
The photochemical behavior of a natural estrogen estriol (E3) was investigated in the presence of the natural photoreactive constituents including nitrate, iron(III), and humic acid (HA). The direct photodegradation of E3 increased with increasing incident light intensity, decreasing initial concentration of E3 and increasing pH in the range of 6.0 to 10.0. The direct photodegradation of the deprotonated speciation of E3 was much faster than that of its protonated form. The presence of NO3− and iron(III) promoted the photochemical loss of E3 in the aqueous solutions. The quenching experiments verified that hydroxyl radicals were predominantly responsible for the indirect photodegradation of E3. HA could act as photosensitizer, light screening agent and free radical quencher. For the first time, the enhancement or inhibition effect of HA on photodegradation was found to depend on the irradiation light intensity. HA enhanced the photodegradation of E3 under sunlight or weak irradiation of simulated sunlight. In contrast, under high irradiation light intensity, HA inhibited the photodegradation. The hydroxylation photoproducts were identified using GC-MS and the photodegradation pathway of E3 was proposed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Science of The Total Environment - Volumes 463–464, 1 October 2013, Pages 802-809
نویسندگان
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