Trace elements (Li, B, Mn and Ba) as sensitive indicators for salinization and freshening events in coastal aquifers

Russak, Amos; Sivan, Orit; Yechieli, Yoseph

doi:10.1016/j.chemgeo.2016.08.003

Cited by 51 publications

(16 citation statements)

References 27 publications

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“…Dissolved irons generally have a terrigenous source and are transported towards the coast during which some are precipitated out of solution through oxidation to ferric oxyhydroxides [48]. However, even though most dissolved irons sourced from catchment precipitates out as the water flow towards the coast, groundwater, and river can still accommodate significant quantities of dissolved iron to coastal environments.…”

Section: Iron (Fe)mentioning

confidence: 99%

“…Manganese occurs naturally in rocks and soils and finds its way into groundwater through rock-water interaction and is a well-known cause of aesthetic problems in drinking water [3,47,48]. Manganese is seldom found as a lone ion, as it is commonly found in iron-bearing water, though less abundantly than Iron.…”

Section: Manganese (Mn)mentioning

confidence: 99%

“…The dynamic of mobilization of Fe, Mn, SO 4 2− , and NO 3 − at the sediment-water interface in the free water surface, especially along the delta and flood plains of coastal areas can be seasonally dependent (and therefore impacted by changes in climate). High contrast in the seasonal concentration of Fe has been found in coastal wetlands and flood plains [48]. It is well-known that pH in water is affected by the biogeochemical process which occurs either in coastal wetlands or river channels and shallow unconfined aquifers between the period of the end of one season and the beginning of another [5][6][7].…”

Section: Seasonal Effect Of Climate Change On Biogeochemical Processesmentioning

confidence: 99%

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Assessing the Impact of Climate Change on Groundwater Quality of the Shallow Coastal Aquifer of Eastern Dahomey Basin, Southwestern Nigeria

Aladejana

Kalin

Sentenac

et al. 2020

Water

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Despite the increasing interest in climate change and water security, research linking climate change and groundwater quality is still at an early stage. This study explores the seasonal effect of the change in biogeochemical process for the redox-sensitive ions and metals Fe2+, Mn2+, SO42−, and NO3− to assess the groundwater quality of the shallow coastal aquifer of Eastern Dahomey Basin in southwestern Nigeria. Field physicochemical measurement of EC, pH TDS, Eh, salinity, temperature, and the static water level (SWL) was carried out on 250 shallow wells; 230 water samples were collected for analysis between June 2017 and April 2018. A spatial distribution map of these ions and metals showed an increasing concentration in the dry season water samples compared to those of the wet season. This higher concentration could be attributed to change in the intensity of hydrochemical processes such as evaporation, redox, and mineral precipitation. Results of linear regression modelling established significant relationships between SWL, SO42−, NO3−, Fe, and Eh for both wet and dry seasons with the p-value falling between 75% and 95%, which can also be seen in the plots of Eh/ORP against Fe2+, Mn2+, SO42−, and NO3−. These results revealed the influence of the redox process for both seasons, while also having a higher impact in the dry season while variation of concentration revealed decrease with increase in depth, which could be attributed to a decrease in well hydraulic properties and aeration. An Eh-pH geochemical diagram revealed NO3− as the controlling biogeochemical process over Fe in most of the sample wells. Concentrations of NO3−, Fe, and Mn are above the World Health Organization’s (WHO) standard for drinking water in most water samples. This study has established the link between climate change and groundwater quality in shallow coastal aquifers and suggested the need for strategic groundwater management policy and planning to ameliorate groundwater quality deterioration.

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Section: Iron (Fe)mentioning

confidence: 99%

Section: Manganese (Mn)mentioning

confidence: 99%

Section: Seasonal Effect Of Climate Change On Biogeochemical Processesmentioning

confidence: 99%

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Assessing the Impact of Climate Change on Groundwater Quality of the Shallow Coastal Aquifer of Eastern Dahomey Basin, Southwestern Nigeria

Aladejana

Kalin

Sentenac

et al. 2020

Water

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“…Qahman and Larabi (2005) in the study of the seawater intrusion in Gaza aquifer referred a porosity of 0.40. Other papers are flow rates in the range or greater as presented in this research: Russak et al, (2016) in the study of trace elements (Li, B, Mn and Ba) as sensitive indicators for salinization and freshening events in coastal aquifers used a flow rate of about 1 mL/min in the laboratory experiments, double the flow rate employed in this paper; Chang and Clement (2012), in the regional flux experiments used a velocity of 0.832 cm 3 /s, a hundred times the employed (0.5 mL/min). With respect to employed columns in this paper, other laboratory experiments used column with 7 cm length and 1 cm internal diameter, lesser that our column and with the same diameter (Nsir et al, 2014), when pressure drop was negligible and the wall effect are not considered, as the present research.…”

Section: Breakthrough Curves and Transport Column Parametersmentioning

confidence: 99%

Fate of parabens and 4-hydroxybenzoic acid in aquifer materials columns during step experiments with fresh and sea waters

López-Ortiz

Botella

Prats

et al. 2018

Journal of Hydrology

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Please cite this article as: López-Ortiz, C.M., Boluda-Botella, N., Prats-Rico, D., Sentana-Gadea, I., Fate of parabens and 4-hydroxybenzoic acid in aquifer materials columns during step experiments with fresh and sea waters, Journal of Hydrology (2017), doi: https://doi. AbstractCoastal areas submitted to seawater intrusion and with discharges from urban and industrial wastewaters, municipal landfill leachates, rivers, recreational waters and other sources are sensitive to be polluted with parabens. Understanding the fate of these compounds in environmental studies, it requires previously the knowledge of the reactive processes in controlled conditions. In this research, laboratory columns experiments were carried out with a group of parabens (methyl-, ethyl-, propyl-and butylparaben) and their main degradation compound (4-hydroxybenzoic acid) to study mainly the dynamic sorption processes in different aquifer materials (100% sand and heterogeneous: 81% sand, 9% silt and 10% clay) and with fresh and sea waters, the end members of seawater intrusions. To the column hydrodynamic characterization, tracer assays with increase and decrease of salinity were performed, to obtain the mean residence time of each column and other transport parameters which allow us to compare parabens´ sorption in different conditions. The results of the adsorption and desorption of parabens in the sand column demonstrated be fast and simultaneous, with a short delay and without influence of the water salinity. Very different results were found in the column experiments with heterogeneous material, where the presence of clay and organic matter increase the time of adsorption/desorption as the length of the alkyl chain paraben increased, according with their hydrophobicity. It should be noted that despite the quick desorption of the major quantities of parabens, the elution of their trace concentrations was very slow (for the seawater, the buthylparaben required a dimensionless time of 800). Planning the restoration of a coastal aquifer with freshwater, and in the conditions of the studied sand column experiment, it will need a dimensionless time of 160. However, it is necessary to take into account that the studied parabens and 4-hydroxybenzoic acid are biodegradable substances, as can be seen in long term experiments, when bacterial proliferation could occur, despite starting the experiment under sterile conditions.

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“…By definition, springs are the surface outlet of aquifers, and their hydrologic regime is the result of the balance between the water inputs and outputs. Besides the study of the spring flow regime, hydrologic information can be obtained from chemical parameters such as salinity, pH, element concentrations, or isotope ratios of the spring waters (e.g., [11][12][13][14]). Thus, geochemical investigations can provide an alternative approach to characterizing the hydrological properties of coastal karst aquifers, when wells or boreholes are not readily available.…”

Section: Introductionmentioning

confidence: 99%

Freshening of a Coastal Karst Aquifer Revealed by the Temporal Changes in a Spring Water Composition (La Palme, Southern France)

et al. 2019

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Coastal karst aquifers are vulnerable to sea level rise and seawater intrusion. Knowledge of aquifer hydrological characteristics is therefore essential to managing this water resource. Long-term aquifer monitoring may not always be possible, especially in areas that humans frequent for recreational purposes. However, hydrological information can be deduced from the chemical composition of periodically sampled groundwaters. We characterized the complete chemical composition (temperature, pH, salinity, ORP, O2, Na-K-Ca-Mg-Ba-Sr-Si-Cl-SO4-DIC, and DOC) of a brackish karstic spring located along the French Mediterranean coast (La Palme). The salinity of the spring water varied between 4 and 9 during the 2.5 year period of observation. Chemical analyses revealed that the spring is modified from modern seawater, as shown by Na-normalized dissolved element concentrations. Thermodynamic calculations of mineral saturation states (PHREEQC) point to aragonite and barite saturation and elevated equilibrium CO2 partial pressure. The simultaneous salinity minima and oxygen maxima coincide with extreme values of dissolved element concentrations. This indicates that variation in salinity and water chemistry in La Palme coastal aquifer is primarily driven by infiltration of fresh rainwater. This study shows that geochemical investigations can provide an alternative approach to characterizing the hydrological properties of coastal karst aquifers when wells or boreholes are not readily available.

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Trace elements (Li, B, Mn and Ba) as sensitive indicators for salinization and freshening events in coastal aquifers

Cited by 51 publications

References 27 publications

Assessing the Impact of Climate Change on Groundwater Quality of the Shallow Coastal Aquifer of Eastern Dahomey Basin, Southwestern Nigeria

Assessing the Impact of Climate Change on Groundwater Quality of the Shallow Coastal Aquifer of Eastern Dahomey Basin, Southwestern Nigeria

Fate of parabens and 4-hydroxybenzoic acid in aquifer materials columns during step experiments with fresh and sea waters

Freshening of a Coastal Karst Aquifer Revealed by the Temporal Changes in a Spring Water Composition (La Palme, Southern France)

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