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| Molecular Structures Analysis of Dissolved Organic Matter in Soil and Water of Danjiangkou Reservoir |
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| DOI： |
| KeyWord:dissolved organic matter soil water Fourier transform－ion cyclotron resonance mass spectrometry（FT－ICR MS） |
| Author | Institution |
| ZHOU Ya-ru，HAO Rong，WU Yu-peng，HE Chen，SHI Quan，HU Rong-gui |
1. Key Laboratory of Arable Land Conservation in the Middle and Lower Reaches of Yangtze River，Ministry of Agriculture，College of Resources and Environment，Huazhong Agricultural University，Wuhan ，China; 2. State Key Laboratory of Heavy Oil Processing，College of Chemical Engineering and Environment，China University of Petroleum，Beijing ，China |
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| Abstract: |
| Fourier transform－ion cyclotron resonance mass spectrometry（FT－ICR MS） was applied to the analysis of the molecular structure characteristics of dissolved organic matter（DOM） in soil and water of Danjiangkou Reservoir in this paper．The compound type distribution，equivalent double bond number and carbon number distribution of soil and aquatic DOM were obtained．The results showed that the soil DOM was composed of 6 classes of compounds，i.e. CHO，CHOS1，CHON1，CHON2，CHON3 and CHON1S1，of which the CHO class was the most abundant，and the major part of this class was lignin．Meanwhile，the aromatic structures of soil DOM were mainly related to CHO and CHON1 class compounds．The molecules with low and high oxygen atoms were likely to contain aromatic structures，while the constituent of aquatic DOM was similar to that of soil，but the ratio of each class among 6 classes was different between both of them．The major parts of CHO class species of aquatic DOM were also lignin．Aromatic structure was also mainly related to CHO and CHON1 class compounds．The molecules with low oxygen atoms were likely to contain branched chain structures，while the molecules of oxygen atoms from 4 to 19 contain more carboxyl and aromatic structures．This study provided convincing evidence for better understanding the DOM molecular structure from different ecosystems． |
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