Ca2+ and SO42- interactions with dissolved organic matter: Implications of groundwater quality for CKDu incidence in Sri Lanka
文献类型：期刊论文
| 作者 | Makehelwala, Madhubhashini; Wei, Yuansong; Weragoda, Sujithra K.; Weerasooriya, Rohan |
| 刊名 | JOURNAL OF ENVIRONMENTAL SCIENCES
 |
| 出版日期 | 2020-02 |
| 卷号 | 88页码:326-337 |
| 关键词 | Dissolved organic carbon Sulfate Calcium Ester group Bidentate |
| ISSN号 | 1001-0742 |
| 英文摘要 | It has recently been proposed that recalcitrant dissolved organic carbon (DOC) in groundwater plays a potent etiological role in the peculiar distribution of chronic kidney disease of unknown etiology (CKDu). This study aims to elucidate the interactions of Ca2+ and SO42- with a model organic fraction of humic acid (SHA) to determine the possible relationship of CKDu incidence with the DOC in drinking water. XPS and FT-IR methods respectively determined the surface functional groups and chemical composition of protonated dissolved organic carbon (HDOC) in a CKDu high-risk zone (HR) of Sri Lanka and in SHA. Higher surface C composition (87.9%) and lower O (11.4%) were observed for HDOC from the HR region than for SHA (C: 73.8%, O: 24.7%). Aromatic C with less O-containing functional groups was observed in HDOC. The IR band at 1170 cm(-1) confirms the formation of organic sulfonate (C-SO3-) on SHA. A band at 1213 cm(-1) due to organic sulfonate in HDOC from the CKDu HR region was also identified. The IR band at 866 cm(-1) evidenced the formation of CaCO3 on SHA above pH 7.4. XPS data confirmed the presence of sulfur oxidation states corresponding to SO32- and SO42- at 168.9 eV and 170.1 eV binding energies, respectively. The binding energies at 347 eV and 351 eV for Ca 2p(3/2) and Ca 2p(1/2) eV, respectively, confirmed the bidentate complexation of Ca2+ with COO- and sulfonate groups on SHA. The organic sulfonate formed is postulated as a uremic toxicant. (C) 2019 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V. |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/45018]  |
| 专题 | 生态环境研究中心_水污染控制实验室 |
| 推荐引用方式 GB/T 7714 | Makehelwala, Madhubhashini,Wei, Yuansong,Weragoda, Sujithra K.,et al. Ca2+ and SO42- interactions with dissolved organic matter: Implications of groundwater quality for CKDu incidence in Sri Lanka[J]. JOURNAL OF ENVIRONMENTAL SCIENCES,2020,88:326-337. |
| APA | Makehelwala, Madhubhashini,Wei, Yuansong,Weragoda, Sujithra K.,&Weerasooriya, Rohan.(2020).Ca2+ and SO42- interactions with dissolved organic matter: Implications of groundwater quality for CKDu incidence in Sri Lanka.JOURNAL OF ENVIRONMENTAL SCIENCES,88,326-337. |
| MLA | Makehelwala, Madhubhashini,et al."Ca2+ and SO42- interactions with dissolved organic matter: Implications of groundwater quality for CKDu incidence in Sri Lanka".JOURNAL OF ENVIRONMENTAL SCIENCES 88(2020):326-337. |
入库方式： OAI收割
来源：生态环境研究中心
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