נגישות
menu      
חיפוש מתקדם
תחביר
חפש...
הספר "אוצר וולקני"
אודות
תנאי שימוש
ניהול
קהילה:
אסיף מאגר המחקר החקלאי
פותח על ידי קלירמאש פתרונות בע"מ -
Trace elements (Li, B, Mn and Ba) as sensitive indicators for salinization and freshening events in coastal aquifers
Year:
2016
Source of publication :
Chemical Geology
Authors :
רוסק, עמוס
;
.
Volume :
441
Co-Authors:
Russak, A., Department of Geological and Environmental Sciences, Ben Gurion University of the Negev, Beer Sheva, P.O.B 653, Beer-Sheva, Israel, Geological Survey of Israel, Malkei Israel St. 30, Jerusalem, Israel
Sivan, O., Department of Geological and Environmental Sciences, Ben Gurion University of the Negev, Beer Sheva, P.O.B 653, Beer-Sheva, Israel
Yechieli, Y., Geological Survey of Israel, Malkei Israel St. 30, Jerusalem, Israel, Department of Environmental Hydrology & Microbiology, Zuckerberg Institute for Water Research, Blaustein Institutes for Desert Studies, Ben Gurion University of the Negev, Sede Boqer, Israel
Facilitators :
From page:
35
To page:
46
(
Total pages:
12
)
Abstract:
The current global intrusion of seawater into coastal aquifers causes salinization of groundwater and thus significant degradation of its quality. This study quantified the effect of seawater intrusion and freshening events in coastal aquifers on trace elements (Li, B, Mn and Ba) across the fresh-saline water interface (FSI) and their possible use as indicators for these events. This was done by combining field data and column experiments simulating these events. The experiments enabled quantification of the processes affecting the trace element composition and examination of whether salinization and freshening events are geochemically reversible, which has been seldom investigated. The dominant process affecting trace element composition during salinization and freshening is ion exchange. The results of the experiments show that the concentrations of major cations and Li+ were reversible during salinization and freshening, whereas B, Mn2 + and Ba2 + were not. During salinization, Li+ and B were depleted due to sorption by 10 and 100 μmol·L− 1, respectively, to about half of their expected conservative concentrations. The relative depletion of Li+ increased with distance from the shore, representing the propagation of salinization. Ba2 + and Mn2 + were desorbed from the sediment during salinization and enriched by tenfold in the aqueous phase compared to their concentration in seawater (~ 0.1 μeq·L− 1). During freshening both were depleted by almost tenfold compared to their concentration in fresh groundwater (~ 0.7 μeq·L− 1). The depletion of Mn2 + is a sensitive marker for freshening because Mn2 + has a strong affinity to the solid phase. Moreover, this study shows that both Mn2 + and Ba2 + can be used as sensitive hydrogeochemical tools to distinguish between salinization and freshening events in the FSI zone in coastal aquifers. © 2016 Elsevier B.V.
Note:
Related Files :
aquifers
Boron
Dominant process
groundwater
hydrogeology
saline water
trace elements
עוד תגיות
תוכן קשור
More details
DOI :
10.1016/j.chemgeo.2016.08.003
Article number:
0
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
24929
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:11
You may also be interested in
Scientific Publication
Trace elements (Li, B, Mn and Ba) as sensitive indicators for salinization and freshening events in coastal aquifers
441
Russak, A., Department of Geological and Environmental Sciences, Ben Gurion University of the Negev, Beer Sheva, P.O.B 653, Beer-Sheva, Israel, Geological Survey of Israel, Malkei Israel St. 30, Jerusalem, Israel
Sivan, O., Department of Geological and Environmental Sciences, Ben Gurion University of the Negev, Beer Sheva, P.O.B 653, Beer-Sheva, Israel
Yechieli, Y., Geological Survey of Israel, Malkei Israel St. 30, Jerusalem, Israel, Department of Environmental Hydrology & Microbiology, Zuckerberg Institute for Water Research, Blaustein Institutes for Desert Studies, Ben Gurion University of the Negev, Sede Boqer, Israel
Trace elements (Li, B, Mn and Ba) as sensitive indicators for salinization and freshening events in coastal aquifers
The current global intrusion of seawater into coastal aquifers causes salinization of groundwater and thus significant degradation of its quality. This study quantified the effect of seawater intrusion and freshening events in coastal aquifers on trace elements (Li, B, Mn and Ba) across the fresh-saline water interface (FSI) and their possible use as indicators for these events. This was done by combining field data and column experiments simulating these events. The experiments enabled quantification of the processes affecting the trace element composition and examination of whether salinization and freshening events are geochemically reversible, which has been seldom investigated. The dominant process affecting trace element composition during salinization and freshening is ion exchange. The results of the experiments show that the concentrations of major cations and Li+ were reversible during salinization and freshening, whereas B, Mn2 + and Ba2 + were not. During salinization, Li+ and B were depleted due to sorption by 10 and 100 μmol·L− 1, respectively, to about half of their expected conservative concentrations. The relative depletion of Li+ increased with distance from the shore, representing the propagation of salinization. Ba2 + and Mn2 + were desorbed from the sediment during salinization and enriched by tenfold in the aqueous phase compared to their concentration in seawater (~ 0.1 μeq·L− 1). During freshening both were depleted by almost tenfold compared to their concentration in fresh groundwater (~ 0.7 μeq·L− 1). The depletion of Mn2 + is a sensitive marker for freshening because Mn2 + has a strong affinity to the solid phase. Moreover, this study shows that both Mn2 + and Ba2 + can be used as sensitive hydrogeochemical tools to distinguish between salinization and freshening events in the FSI zone in coastal aquifers. © 2016 Elsevier B.V.
Scientific Publication
You may also be interested in