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Fast Photomineralization of Dissolved Organic Matter in Acid Mine Drainage Impacted Waters
- Source :
- Environmental Science & Technology. 53:6273-6281
- Publication Year :
- 2019
- Publisher :
- American Chemical Society (ACS), 2019.
-
Abstract
- Acid mine drainage (AMD) formed from pyrite (iron disulfide) weathering contributes to ecosystem degradation in impacted waters. Solar irradiation has been shown to be an important factor in the biogeochemical cycling of iron in AMD-impacted waters, but its impact on dissolved organic matter (DOM) is unknown. With a typical AMD-impacted water (pH 2.7-3) collected from the Perry State Forest watershed in Ohio, we observed highly efficient (>80%) photochemical mineralization of DOM within hours in a solar simulator resembling twice summer sunlight at 40°N. We confirmed that the mineralization was initially induced by •OH formed from FeOH2+ photodissociation and was inhibited 2-fold by dissolved oxygen removal, suggesting the importance of both the photochemical reaction and oxygen involvement. Size exclusion chromatography and Fourier transform ion cyclotron resonance mass spectrometry elucidated that any remaining organic matter was comprised of smaller and highly aliphatic compounds. The quantitative and qualitative changes in DOM are likely to constitute an important component in regional carbon cycling and nutrient release and to influence downstream aquatic ecosystems in AMD-affected watersheds.
- Subjects :
- chemistry.chemical_classification
Biogeochemical cycle
Chemistry
Aquatic ecosystem
General Chemistry
Mineralization (soil science)
010501 environmental sciences
engineering.material
Acid mine drainage
01 natural sciences
Mining
Carbon cycle
Environmental chemistry
Dissolved organic carbon
Sunlight
engineering
Environmental Chemistry
Organic matter
Pyrite
Ecosystem
Water Pollutants, Chemical
Ohio
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 15205851 and 0013936X
- Volume :
- 53
- Database :
- OpenAIRE
- Journal :
- Environmental Science & Technology
- Accession number :
- edsair.doi.dedup.....56992b7e92c0ad22d5337213b15c31b4