| Evaluating and improving the reliability of the UV-persulfate method for the determination of TOC/DOC in surface waters | |
Yang, Hankun; Graham, Nigel J. D.; Wang, Wenyu; Liu, Mengjie; Yu, Wenzheng
| |
| 2021-05-15 | |
| Source Publication | WATER RESEARCH
 |
| ISSN | 0043-1354 |
| Volume | 196Pages:- |
| Abstract | The UV-persulfate oxidation method is widely used for determining the total organic carbon concentration of aqueous samples (denoted for convenience as UVP-TOC). However, for some surface water samples, the measurement of TOC by this method can be unreliable, deviating significantly from the true carbon content. In this study, the performance of the UVP-TOC method has been investigated by comparing the results from the analysis of a variety of aqueous samples that included two kinds of surface water samples and related surface water model substances: bovine serum albumin (BSA), sodium alginate (SA), humic acid (HA), tannic acid (TA), benzoic acid (BA) and citric acid (CA), with those from a high-temperature combustion method (elemental analysis); the latter providing the true carbon content value. By comparing the above data, it was found that the UVP-TOC method significantly underestimated the TOC value of the surface water samples, and it was also found that the model components BSA (protein) and HA (humic substances, HS) had a substantial influence on the TOC underestimation, while the SA (polysaccharide), TA (complex organic molecule) and CA/BA (small molecules) had little effect. The results showed that the agglomeration within and between BSA and HA molecules was an important reason for the inaccurate UVP-TOC values of BSA and HA. A further limitation was that for BSA, surfactants (e.g. sodium dodecylbenzene sulfonate, SDBS) and other surfactant-like substances, foam was formed during the CO2 removal purging process by N-2 that seriously interfered with the determination of TOC. The study provides new information and insight into the causes of inaccuracies in the UVP-TOC analysis of surface waters and possible approaches to improve the accuracy. (C) 2021 Elsevier Ltd. All rights reserved. |
| Department | 环境水质学国家重点实验室 |
| Keyword | TOC UV-persulfate oxidation method NOM Surface water Incomplete oxidation |
| WOS Research Area | Engineering, Environmental ; Environmental Sciences ; Water Resources |
| Document Type | 期刊论文 |
| Identifier | https://ir.rcees.ac.cn/handle/311016/45940 |
| Collection | 环境水质学国家重点实验室 |
| Affiliation | 1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Aquat Chem, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China 2.Imperial Coll London, Dept Civil & Environm Engn, South Kensington Campus, London SW7 2AZ, England 3.Tiangong Univ, Sch Environm Sci & Engn, State Key Lab Separat Membrane & Membrane Proc, Tianjin 300387, Peoples R China |
| Recommended Citation GB/T 7714 | Yang, Hankun,Graham, Nigel J. D.,Wang, Wenyu,et al. Evaluating and improving the reliability of the UV-persulfate method for the determination of TOC/DOC in surface waters[J]. WATER RESEARCH,2021,196:-. |
| APA | Yang, Hankun,Graham, Nigel J. D.,Wang, Wenyu,Liu, Mengjie,&Yu, Wenzheng.(2021).Evaluating and improving the reliability of the UV-persulfate method for the determination of TOC/DOC in surface waters.WATER RESEARCH,196,-. |
| MLA | Yang, Hankun,et al."Evaluating and improving the reliability of the UV-persulfate method for the determination of TOC/DOC in surface waters".WATER RESEARCH 196(2021):-. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| Evaluating and impro（2389KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment