Citation: TANG Zhu-Rui, HUANG Cai-Hong, TAN Wen-Bing, HE Xiao-Song, ZHANG Hui, LI Dan, XI Bei-Dou. Electron Transfer Capacities of Dissolved Organic Matter Derived from Swine Manure Based on Eletrochemical Method[J]. Chinese Journal of Analytical Chemistry, ;2018, 46(3): 422-431. doi: 10.11895/j.issn.0253-3820.171436 shu

Electron Transfer Capacities of Dissolved Organic Matter Derived from Swine Manure Based on Eletrochemical Method

TANG Zhu-Rui ^1,2, ,
HUANG Cai-Hong ^2,3 ,
TAN Wen-Bing ^2,3 ,
HE Xiao-Song ^2,3 ,
ZHANG Hui ^2,3 ,
LI Dan ^2,3 ,
XI Bei-Dou ^2,3,4

1.
College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541006, China;
2.
Innovation Base of Ground Water & Environmental System Engineering, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;
3.
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;
4.
School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China

Received Date: 20 November 2017
Revised Date: 30 December 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (No. 51508540).

Dissolved organic matter (DOM) is the most active fraction of compost organic matter. The presence of the redox-active functional groups in DOM allows it to act an electron shuttle to promote the electron transfer between microorganisms and terminal electron acceptors. In this study, the electron transfer capacities (ETCs) of compost DOM samples at eight different composting stages were determined by electrochemical method. The 2, 2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) and Diquat dibro-mide monohydrate (DQ) were used to measured electron donating capacity (EDC) and electron accepting capacity (EAC) with working voltage 0.61 V/-0.49 V, respective. The evolution characteristics of the chemical structures and components were analyzed by combining the three-dimensional fluorescence spectra, fourier transform infrared (FTIR) spectra and elemental analysis. The results showed that the electron donating capacity (EDC) of DOMincreased from 16.850 μmol e^-/(g C) to 22.077 μmol e^-/(g C), The corresponding electron accepting capacity (EAC) decreased from 1.866 μmol e^-/(g C)to 1.779 μmol e^-/(g C). The results of three-dimensional fluorescence spectroscopy show that the relative contents of humuc-likeand protein-like components gradually increased and decreased, respectively, during the composting process. The humuc-like components were the main contributor for the ETC of DOM. FTIR spectra shows that there was no significant change in the hydroxyl and carboxyl group contentsof DOM during composting, suggesting no contribution of these function groups to the ETC of DOM. The elemental analysis showed that the content of oxygen in the DOM increased during the composting process, while the sulfur-containing group may be dominated contributor forits ETC.
- Composting,
- Dissolved organic matter,
- Electron transfer capacity,
- Three-dimensional fluorescence,
- Infrared spectroscopy
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