TY - JOUR
T1 - Chemical characterization of dissolved organic matter as disinfection byproduct precursors by UV/fluorescence and ESI FT-ICR MS after smoldering combustion of leaf needles and woody trunks of pine (Pinus jeffreyi)
AU - Chen, Huan
AU - Ersan, Mahmut Selim
AU - Tolić, Nikola
AU - Chu, Rosalie K.
AU - Karanfil, Tanju
AU - Chow, Alex T.
N1 - Funding Information:
This work was supported by a research grant from the USEPA (National Priorities: Water Scarcity & Drought - USEPA Grant Number: R835864) and USDA NIFA (Grant Number: 2018-67019-27795). This manuscript has not been subjected to a policy review of the agency and therefore does not necessarily reflect the agency's views. Thanks Dr. Robert Rhew, the director of UC Berkeley Sagehen Creek Field Station, for field site access and sample collection. The FT-ICR MS analysis was conducted at the Environmental Molecular Sciences Laboratory (EMSL), Pacific Northwest National Laboratory (PNNL), Richland, WA.
Funding Information:
This work was supported by a research grant from the USEPA (National Priorities: Water Scarcity & Drought - USEPA Grant Number: R835864) and USDA NIFA (Grant Number: 2018-67019-27795). This manuscript has not been subjected to a policy review of the agency and therefore does not necessarily reflect the agency's views. Thanks Dr. Robert Rhew, the director of UC Berkeley Sagehen Creek Field Station, for field site access and sample collection. The FT-ICR MS analysis was conducted at the Environmental Molecular Sciences Laboratory (EMSL), Pacific Northwest National Laboratory (PNNL), Richland, WA.
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2022/2/1
Y1 - 2022/2/1
N2 - Forested land plays an essential role in water supply across the United States (US). Smoldering commonly existing in wildfires contributes significantly to biomass consumption and gas emission, but its influence on source water quality has been rarely studied. Here, we investigated the impact of smoldering temperature (i.e., no burn, 250, 400, and 600 °C) on the nutrients, elements, and dissolved organic matter (DOM) of water extracts from the residues of the leaf needles and woody trunks of pine (Pinus jeffreyi) under the lab-simulated smoldering fire. Results showed the increase of pH and the yields of the dominated exchangeable cations of K+ and Mg2+, P, PO43−-P, and SO42− with increasing temperature increasing from 250 to 600 °C, whereas significant decreases in the fraction of dissolved organic C in residue C with increasing temperature and the yields of dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) after burnings. Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) presented consistent results with UV/fluorescence, suggesting that the unburned materials contained more biodegradable tyrosine/tryptophan/soluble microbial byproduct-like compounds with high molecular weight (MW), whereas the 600 °C-smoldering materials composed of more aromatic, humified, fulvic/humic acid-like, and oxidized compounds with a potentially high density of C=C bonds had less reactivity in forming trihalomethanes (THMs) and haloacetonitriles (HANs). Our study indicates the smoldering-dominated prescribed fire as a potential forest management strategy for reducing biomass fuel and disinfection byproducts (DBPs) precursors in source water from forested lands.
AB - Forested land plays an essential role in water supply across the United States (US). Smoldering commonly existing in wildfires contributes significantly to biomass consumption and gas emission, but its influence on source water quality has been rarely studied. Here, we investigated the impact of smoldering temperature (i.e., no burn, 250, 400, and 600 °C) on the nutrients, elements, and dissolved organic matter (DOM) of water extracts from the residues of the leaf needles and woody trunks of pine (Pinus jeffreyi) under the lab-simulated smoldering fire. Results showed the increase of pH and the yields of the dominated exchangeable cations of K+ and Mg2+, P, PO43−-P, and SO42− with increasing temperature increasing from 250 to 600 °C, whereas significant decreases in the fraction of dissolved organic C in residue C with increasing temperature and the yields of dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) after burnings. Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) presented consistent results with UV/fluorescence, suggesting that the unburned materials contained more biodegradable tyrosine/tryptophan/soluble microbial byproduct-like compounds with high molecular weight (MW), whereas the 600 °C-smoldering materials composed of more aromatic, humified, fulvic/humic acid-like, and oxidized compounds with a potentially high density of C=C bonds had less reactivity in forming trihalomethanes (THMs) and haloacetonitriles (HANs). Our study indicates the smoldering-dominated prescribed fire as a potential forest management strategy for reducing biomass fuel and disinfection byproducts (DBPs) precursors in source water from forested lands.
KW - Disinfection byproducts
KW - Dissolved organic matter
KW - FT-ICR MS
KW - Optical properties
KW - Smoldering
KW - Wildfire
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U2 - 10.1016/j.watres.2021.117962
DO - 10.1016/j.watres.2021.117962
M3 - Article
AN - SCOPUS:85121440254
VL - 209
JO - Water Research
JF - Water Research
SN - 0043-1354
M1 - 117962
ER -