期刊
WATER RESEARCH
卷 99, 期 -, 页码 200-208出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2016.04.062
关键词
Fluoride; Diffusive gradients in thin-films; Sediment; Surface water
资金
- National Science Foundation of China [21477053]
- Specialized Research Fund for the Doctoral Program of Higher Education, Ministry of Education of China [20120091120016]
- Fundamental Research Funds for the Central Universities [021114380020]
- program B for Outstanding PhD candidate of Nanjing University
- Newton Fund/Royal Society
- NFSC [R1504GFS, 21511130063]
Natural mineral-water interface reactions drive ecosystem/global fluoride (F-) cycling. These small-scale processes prove challenging to monitoring due to mobilization being highly localized and variable; influenced by changing climate, hydrology, dissolution chemistries and pedogenosis. These release events could be captured in situ by the passive sampling technique, diffusive gradients in thin-films (DGT), providing a cost-effective and time-integrated measurement of F- mobilization. However, attempts to develop the method for F- have been unsuccessful due to the very restrictive operational ranges that most F--absorbents function within. A new hybrid-DGT technique for F- quantification containing a three-phase fine particle composite (Fe Al Ce, FAC) adsorbent was developed and evaluated. Sampler response was validated in laboratory and field deployments, passing solution chemistry QC within ionic strength and pH ranges of 0-200 mmol L-1 and 43-9.1, respectively, and exhibiting high sorption capacities (98 8 g cm-2). FAC-DGT measurements adequately predicted up to weeklong averaged in situ F- fluvial fluxes in a freshwater river and F- concentrations in a wastewater treatment flume determined by high frequency active sampling. While, millimetre-scale diffusive fluxes across the sediment-water interface were modeled for three contrasting lake bed sediments from a F--enriched lake using the new FAC-DGT platform. (C) 2016 Elsevier Ltd. All rights reserved.
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