Controls on elevated fluoride and arsenic concentrations in groundwater from the Yuncheng Basin, China
文献类型：SCI/SSCI论文
| 作者 | Currell M. ; Cartwright I. ; Raveggi M. ; Han D. M. |
| 发表日期 | 2011 |
| 关键词 | northern china inner-mongolia natural-waters loess aquifer taiyuan basin provenance contamination geochemistry argentina behavior |
| 英文摘要 | Chemical analysis of groundwater and sediments was carried out to investigate causes of elevated F(-) (1.5-6.6 mg/L) and As concentrations (10-27 mu g/L; one sample affected by local contamination with 4870 mu g/L As), in groundwater from the Yuncheng Basin, northern China. Groundwater from 9 out of 73 wells contains both F and As concentrations above World Health Organisation safe drinking guidelines (>1.5 mg/L and >10 mu g/L respectively); F(-) concentrations above safe levels are more widespread than As (27 vs. 12 wells). The elevated As and F concentrations represent a significant health risk, as groundwater is widely used to supply agricultural and domestic water in the region. High F and As concentrations occur in shallow groundwater affected by agriculture and deep groundwater with long residence times (>13 ka) that shows little sign of anthropogenic influence. The strong positive correlation between groundwater F/Cl and As/Cl ratios (r(2) = 0.98 and 0.77 in shallow and deep groundwater, respectively) indicates that these elements are mobilized and enriched by common processes. Positive correlations between F and As concentrations and Na/Ca ratios (r2 = 0.67 and 0.46, respectively) indicate that groundwater major ion chemistry plays a significant role in mobilizing F and As. Mobilization likely occurs via de-sorption of As and F anions (e.g. HAsO(4)(2-) and F(-)) from hydrous metal oxides. Moderate positive correlations between pH and As and F concentrations (r(2) = 0.36 and 0.17, respectively) indicate that high pH may favour de-sorption, while HCO(3) may act as a sorption competitor. High groundwater Na/Ca ratios likely result from cation exchange, while pH and HCO(3) contents are predominantly controlled by carbonate weathering reactions. Sediments from the area were reacted with various water solutions, producing F concentrations between 0.49 and 2.7 mg/L and As concentrations between 0.51 and 16.7 mu g/L Up to 45% more F and 35% more As were released when sediments were reacted with a Na-rich, Ca-poor solution compared to a Ca-rich solution; this is consistent with increased mobilization of F- and HAsO(4)(2-) by Na-rich, Ca-poor groundwater. Increasing F and As concentrations across a wide area caused by high levels of pumping is a potential future health concern. (C) 2011 Elsevier Ltd. All rights reserved. |
| 出处 | Applied Geochemistry |
| 卷 | 26 |
| 期 | 4 |
| 页 | 540-552 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0883-2927 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/24176]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Currell M.,Cartwright I.,Raveggi M.,et al. Controls on elevated fluoride and arsenic concentrations in groundwater from the Yuncheng Basin, China. 2011. |
入库方式： OAI收割
来源：地理科学与资源研究所
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