Comparing electron donating/accepting capacities (EDC/EAC) between crop residue-derived dissolved black carbon and standard humic substances

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 环境化学与生态毒理学国家重点实验室

	Comparing electron donating/accepting capacities (EDC/EAC) between crop residue-derived dissolved black carbon and standard humic substances
	Zheng, Xiaojian ; Liu, Yafang ; Fu, Heyun 4; Qu, Xiaolei 4; Yan, Mingquan 3; Zhang, Shuzhen 2; Zhu, Dongqiang
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2019-07-10
卷号	673 页码:29-35
关键词	Dissolved black carbon Electron-donating capacity Electron-accepting capacity Phenolic groups Fluorescence UV-vis absorption
ISSN号	0048-9697
英文摘要	Although dissolved black carbon (DBC) is an important component of dissolved organic matter (DOM), little is known about the electron transfer properties of DBC and their correlation with the structural properties. This study determined the electron donating/accepting capacities (EDC/EAC) of six DBC collected from water extracts of black carbon derived by pyrolyzing crop residues (soybean, wheat, rice, sorghum, peanut, and corn) using an electrochemical approach, along with their chemical and spectroscopic properties. The EDC of the tested DBC ranged from 2.42 to 7.10 mmol(e-)(gC)(-1) and was generally much higher than the EDC (1.31-3.78 mmol(e-)(gC)(-1)) of the four standard dissolved humic substances (DHS). In contrast, with the exception of the sorghum DBC, the EAC of all DBC (0.40-0.81 mmol(e-)(gC)(-1)) was apparently lower than the EAC ofDHS (0.87-1.68 mmol(e-)(gC)(-1)). For the whole pool of DBC and DHS, a strong positive correlation (r = 0.94, P < 0.05) existed between the EDC and the phenolic group content quantified by base titration, suggesting that phenolic groups were the major electron-donating groups. The EAC and EDC of the tested DOM pool were further correlated with the components identified from the fluorescence excitation emission matrices and parallel factor (EEM-PARAFAC) analysis. This is the first study to show that DBC has significantly different electron transfer properties from humic substances and thus likely behaviors differently in many geochemical and environmental aspects. Capsule: Dissolved black carbon (DBC) has significantly different electron-donating/accepting capacities (EDC/EAC) from humic substances. (C) 2019 Elsevier B.V. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/42526]
专题	生态环境研究中心_环境化学与生态毒理学国家重点实验室
作者单位	1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China 2.Peking Univ, Sch Environm Sci & Engn, Beijing 100871, Peoples R China 3.Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, Nanjing 210046, Jiangsu, Peoples R China 4.Peking Univ, Minist Educ Earth Surface Proc, Key Lab, Sch Urban & Environm Sci, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Zheng, Xiaojian,Liu, Yafang,Fu, Heyun,et al. Comparing electron donating/accepting capacities (EDC/EAC) between crop residue-derived dissolved black carbon and standard humic substances[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2019,673:29-35.
APA	Zheng, Xiaojian.,Liu, Yafang.,Fu, Heyun.,Qu, Xiaolei.,Yan, Mingquan.,...&Zhu, Dongqiang.(2019).Comparing electron donating/accepting capacities (EDC/EAC) between crop residue-derived dissolved black carbon and standard humic substances.SCIENCE OF THE TOTAL ENVIRONMENT,673,29-35.
MLA	Zheng, Xiaojian,et al."Comparing electron donating/accepting capacities (EDC/EAC) between crop residue-derived dissolved black carbon and standard humic substances".SCIENCE OF THE TOTAL ENVIRONMENT 673(2019):29-35.