Effect of preozonation on the characteristic transformation of fulvic acid and its subsequent trichloromethane formation potential: Presence or absence of bicarbonate
文献类型：期刊论文
| 作者 | Li, Jing; Liu, Huijuan; Zhao, Xu; Qu, Juhui; Liu, Ruiping; Ru, Ha |
| 刊名 | CHEMOSPHERE
 |
| 出版日期 | 2008-04 |
| 卷号 | 71期号:9页码:1639-1645 |
| 关键词 | ozonation bicarbonate TCMFP molecular weight (MW) distribution Fourier transform infrared (FTIR) spectrum |
| 英文摘要 | The effects of bicarbonate on the characteristic transformation of fulvic acid (FA) and its subsequent trichloromethane formation potential (TCMFP) were investigated in the process of preozonation. Dissolved organic carbon (DOC) removal rate and the residual aqueous ozone concentration during preozonation were measured with different bicarbonate concentration. The presence of bicarbonate inhibited DOC removal and decreased TCMFP yields in the initial oxidation period. In order to explain these phenomena, the molecular weight (MW) distribution (<5, 5-10, 10-30, and >30 kDa) and corresponding TCMFP were investigated for FA and its subsequent oxidation products. Furthermore, transformation of molecular structure, based on MW distribution, was also characterized with Fourier transform infrared (FTIR) spectrum. Bicarbonate showed different inhibiting effects on TCMFP of organic species with different MW, and more significant TCMFP decrement was observed for the high MW fraction (>30 kDa) than for the low MW fractions. Preozonation led to obvious reduction on DOC and UV254 in most of MW fractions wherever bicarbonate was present or not, demonstrating that ozone contributed to both organics mineralization and structure variation, synchronously. As being indicated from the results of FTIR and gas chromatography-mass spectrometry, the functional groups such as alcohols, epoxides and phenols, the formation of which was promoted with hydroxyl radicals ((OH)-O-center dot) and would be remarkably inhibited by bicarbonate, were responsible for the increment of TCM precursor's concentration during ozonation. Results of these studies confirmed low dosage bicarbonate affecting the ozonation pathways, influencing the intermediate species formation and impacting its subsequent TCMFP yields through inhibiting the (OH)-O-center dot radicals reactions mainly occurred in high MW fractions. (C) 2008 Elsevier Ltd. All rights reserved. |
| WOS记录号 | WOS:000255714900004 |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/22234]  |
| 专题 | 生态环境研究中心_环境水质学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Li, Jing,Liu, Huijuan,Zhao, Xu,et al. Effect of preozonation on the characteristic transformation of fulvic acid and its subsequent trichloromethane formation potential: Presence or absence of bicarbonate[J]. CHEMOSPHERE,2008,71(9):1639-1645. |
| APA | Li, Jing,Liu, Huijuan,Zhao, Xu,Qu, Juhui,Liu, Ruiping,&Ru, Ha.(2008).Effect of preozonation on the characteristic transformation of fulvic acid and its subsequent trichloromethane formation potential: Presence or absence of bicarbonate.CHEMOSPHERE,71(9),1639-1645. |
| MLA | Li, Jing,et al."Effect of preozonation on the characteristic transformation of fulvic acid and its subsequent trichloromethane formation potential: Presence or absence of bicarbonate".CHEMOSPHERE 71.9(2008):1639-1645. |
入库方式： OAI收割
来源：生态环境研究中心
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