Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 739, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.140378
Keywords
Dissolved organic matter; Biochar; Rice straw; FRCR mass spectrometry; Parallel factor; Complexation modeling
Categories
Funding
- National Natural Science Foundation of China [51879103]
- Key R&D Program of Department of Science and Technology of Hunan Province in China [2017SK2351]
- Science and Technology Plan Project of Hunan Province in China [2018SK2047]
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It remains debatable whether carbonized straw reapplying is a better solution than direct straw reapplying. Comparison of the characteristics and complexation behaviors of dissolved organic matter (DOM) derived from straw (ST) and biochar (BC) may offer new insights, but little current information exists. Herein, DOM samples were characterized by Fourier transform ion cyclotron resonance mass spectrometry (FTICR-MS), revealing that the molecular weight and condensed aromatic components of BCDOM (457.70 Da and 71.16%, respectively) were higher than those of STDOM (433.48 Da and 3.13%, respectively). In particular, the N-containing compounds of BCDOM was more aromatic than STDOM. By combining spectroscopic techniques, complexation modeling, and chemometric analysis, BCDOM was shown to exhibit higher binding parameters (log K M ) and more binding sites for Pb than STDOM. Noteworthily, the two binding sites, aromatic N=O and aromatic NO2, existed only in the interaction of BCDOM with Pb. Furthermore, while phenol-OH displayed the fastest response to Pb in both STDOM and BCDOM, the binding sequences were not exactly the same. These differences may be related to the variations in the aromaticity and N-containing structures of DOM detected by FTICR-MS. These findings have implications on the stewardship of straw- and biochar-amended soil. (C) 2020 Elsevier B.V. All rights reserved.
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