Reducing organic substances from anaerobic decomposition of hydrophytes |
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Authors: | Wen Zhang Qingman Li Xingxiang Wang Yu Ding Jingxian Sun |
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Institution: | (1) Institute of Hydrobiology, Chinese Academy of Sciences, 430072 Wuhan, People’s Republic of China;(2) Institute of Soil Science, Chinese Academy of Sciences, 210008 Nanjing, People’s Republic of China;(3) Graduate School of the Chinese Academy of Sciences, 100039 Beijing, People’s Republic of China |
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Abstract: | Oxidation–reduction properties of surface sediments are tightly associated with the geochemistry of substances, and reducing
organic substances (ROS) from hydrophytes residues may play an important role in these processes. In this study, composition,
dynamics, and properties of ROS from anaerobic decomposition of Eichhornia crassipes (Mart.) Solms, Potamogenton crispus
Linn, Vallisneria natans (Lour.) Hara, Lemna trisulca Linn and Microcystis flos-aquae (Wittr) Kirch were investigated using differential pulse voltammetry (DPV). The type of hydrophytes determined both the reducibility and
composition of ROS. At the peak time of ROS production, the anaerobic decomposition of M. flos-aquae produced 6 types of ROS, among which 3 belonged to strongly reducing organic substance (SROS), whereas there were only 3–4
types of ROS from the other hydrophytes, 2 of them exhibiting strong reducibility. The order of potential of hydrophytes to
produce ROS was estimated to be: M. flos-aquae > E. crassipes > L. trisulca > P. crispus ≈ V. natans, based on the summation of SROS and weakly reducing organic substances (WROS). The dynamic pattern of SROS production was
greatly different from WROS. The total SROS appeared periodic fluctuation with reducibility gradually weakening with incubation
time, whereas the total WROS increased with incubation time. Reducibility of ROS from hydrophytes was readily affected by
acid, base and ligands, suggesting that their properties were related to these aspects. In addition to the reducibility, we
believe that more attention should be paid to the other behaviors of ROS in surface sediments. |
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Keywords: | Anaerobic decomposition Anaerobic microbe Hydrophytes Reducing organic substance Voltammetry |
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