کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8910864 1637933 2018 49 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The role of iron and reactive oxygen species in the production of CO2 in arctic soil waters
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
The role of iron and reactive oxygen species in the production of CO2 in arctic soil waters
چکیده انگلیسی
Hydroxyl radical (OH) is a highly reactive oxidant of dissolved organic carbon (DOC) in the environment. OH production in the dark was observed through iron and DOC mediated Fenton reactions in natural environments. Specifically, when dissolved oxygen (O2) was added to low oxygen and anoxic soil waters in arctic Alaska, OH was produced in proportion to the concentrations of reduced iron (Fe(II)) and DOC. Here we demonstrate that Fe(II) was the main electron donor to O2 to produce OH. In addition to quantifying OH production, hydrogen peroxide (H2O2) was detected in soil waters as a likely intermediate in OH production from oxidation of Fe(II). For the first time in natural systems we detected carbon dioxide (CO2) production from OH oxidation of DOC. More than half of the arctic soil waters tested showed production of CO2 under conditions conducive for production of OH. Findings from this study strongly suggest that DOC is the main sink for OH, and that OH can oxidize DOC to yield CO2. Thus, this iron-mediated, dark chemical oxidation of DOC may be an important component of the arctic carbon cycle.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geochimica et Cosmochimica Acta - Volume 224, 1 March 2018, Pages 80-95
نویسندگان
, , , ,