Journal
ORGANIC GEOCHEMISTRY
Volume 112, Issue -, Pages 16-21Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.orggeochem.2017.06.018
Keywords
Photodissolution; Charcoal; Dissolved black carbon; FT-ICR-MS
Categories
Funding
- National Science Foundation - United States through the Florida Coastal Everglades Long-Term Ecological Research program [DEB-1237517]
- National Science Foundation - United States through the NHMFL grant [DMR-1157490]
- National Science Foundation - United States through the George Barley Endowment
- Division Of Environmental Biology
- Direct For Biological Sciences [1237517] Funding Source: National Science Foundation
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This study investigates the effect of photodissolution on the production of dissolved black carbon (DBC) from particulate charcoal and a fire-impacted soil. A soil sample and a char sample were collected within the burn vicinity of the 2012 Cache La Poudre River wildfire and irradiated in deionized water with artificial sunlight. Photoexposure of the suspended char and soil significantly enhanced production of DBC after 7 days continuous exposure to the simulated sunlight. The increase was coupled with an increase in the DBC polycondensed character. In agreement with this, characterization using Fourier transformion cyclotron resonance-mass spectrometry (FT-ICR-MS) showed an increase in the number of BC molecular formulae detected and in their average molecular weight, suggesting that increasing photoexposure is required for dissolution of larger, more polycondenced DBC compounds. An increase in molecular signatures with lower H/C ratio and higher O/C ratio after 7 days photoexposure suggested increasing functionality of newly produced DBC with irradiation time, and therefore photooxidation as a potential mechanism for the photodissolution of BC. The photoproduced DBC was also strongly coupled with the photoproduced bulk dissolved organic carbon (DOC). The results suggest that photodissolution may be a significant and previously unrecognized mechanism of DBC translocation to aquatic systems. (C) 2017 Elsevier Ltd. All rights reserved.
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