کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5783443 | 1637949 | 2017 | 45 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The role of reactive oxygen species in the degradation of lignin derived dissolved organic matter
ترجمه فارسی عنوان
نقش گونه های اکسیژن واکنشی در تخریب مواد آلی حل شده از لیگنین
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
چکیده انگلیسی
Evidence suggests that reactive oxygen species (ROS) are important in transforming the chemical composition of the large pool of terrestrially-derived dissolved organic matter (DOM) exported from land to water annually. However, due to the challenges inherent in isolating the effects of individual ROS on DOM composition, the role of ROS in the photochemical alteration of DOM remains poorly characterized. In this work, terrestrial DOM was independently exposed to singlet oxygen (1O2), and superoxide (O2- under controlled laboratory conditions). Using ultra-high resolution mass spectrometry to track molecular level alterations of DOM by ROS, these findings suggest exposure to 1O2 (generated using Rose Bengal and visible light) removed formulas with an O/CÂ >Â 0.3, and primarily resulted in DOM comprised of formulas with higher oxygen content, while O2- exposure (from KO2 in DMSO) removed formulas with O/CÂ <Â 0.3 and produced aliphatic formulas (H/CÂ >Â 1.5). Comparison of DOM altered by ROS in this study to riverine and coastal DOM showed that (20-80%) overlap in formulas, providing evidence for the role of ROS in shaping the composition of DOM exported from rivers to oceans.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geochimica et Cosmochimica Acta - Volume 208, 1 July 2017, Pages 171-184
Journal: Geochimica et Cosmochimica Acta - Volume 208, 1 July 2017, Pages 171-184
نویسندگان
Derek C. Waggoner, Andrew S. Wozniak, Rose M. Cory, Patrick G. Hatcher,