Arsenic-fluoride co-contamination in groundwater: Background and anomalies in a volcanic-sedimentary aquifer in central Italy

Parrone, Daniele; Ghergo, Stefano; Frollini, Eleonora; Rossi, David; Preziosi, Elisabetta

doi:10.1016/j.gexplo.2020.106590

Cited by 44 publications

(17 citation statements)

References 46 publications

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“…A series of Pleistocene volcanic structures, associated with productive CO 2 saturated aquifers can be found in central-southern Italy (peri-Tyrrhenian belt) (Cataldi, 1995 ; Minissale, 2004 ; Chiodini et al, 2013 ; Peccerillo, 2017 ). The interactions between groundwater and different effusive products (from sub-alkaline to alkaline basalts, ultrapotassic mafic to ultramafic rock-types, Serri et al, 2001 ) has led to important issues related to As presence in water resources (Parrone et al, 2020 and therein references). The problem of excessive As concentration is often coupled with high amounts of Fe (Gosh et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Fe and As geochemical self-removal dynamics in mineral waters: evidence from the Ferrarelle groundwater system (Riardo Plain, Southern Italy)

Cuoco

Viaroli

Paolucci³

et al. 2021

Environ Geochem Health

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A theoretical pattern for Fe and As co-precipitation was tested directly in a groundwater natural system. Several monitoring wells were sampled to identify the different endmembers that govern the hydrodynamics of the Ferrarelle Groundwater System in the Riardo Plain (Southern Italy). In agreement with recent investigations, we found a mix of a deep and a shallow component in different proportions, resulting in a specific chemical composition of groundwater in each well depending on the percentages of each component. The shallow component was characterized by EC ~ 430 µS/cm, Eh ~ 300 mV, Fe ~ 0.06 µmol/L and As ~ 0.01–0.12 µmol/L, while the deep component was characterized by EC ~ 3400 µS/cm, Eh ~ 170 mV, Fe ~ 140 µmol/L and As ~ 0.59 µmol/L. A general attenuation of As and Fe concentration that was not due to a simple dilution effect was observed in the mixing process. The oxidation of Fe(II) to Fe(III) produces solid precipitates which adsorb As from solution and then co-precipitate. The reactions pattern of Fe(II) oxidation and As adsorption gave a linear function between [As] and [Fe], where the angular coefficient depends on the [O2]/[H+] ratio. Chemical data obtained from our samples showed a very good agreement with this theoretical relationship. The investigated geochemical dynamics represented a natural process of attenuation of Fe and As, two undesirable elements that usually affect groundwater quality in volcanic aquifers in central-southern Italy, which are exploited to supply drinking water. Graphic abstract

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Section: Introductionmentioning

confidence: 99%

Fe and As geochemical self-removal dynamics in mineral waters: evidence from the Ferrarelle groundwater system (Riardo Plain, Southern Italy)

Cuoco

Viaroli

Paolucci³

et al. 2021

Environ Geochem Health

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“…Beyond the common origin of the two elements due to water-rock interaction processes, in the study area, As and F remain strongly linked in aqueous solution, and processes capable of breaking this common mobility do not intervene. On a regional scale, Parrone et al [96] attributed this stable co-presence to the widespread geochemical background of cold groundwater circulating volcanic formations, also highlighting areas where the good correlation is lost due to localized peculiarities (e.g., in the proximity of fractures/faults systems or mineral deposits).…”

Section: Arsenic and Other Ptes: Linking Solid Matrix Analysis With G...mentioning

confidence: 99%

Water-Rock Interaction Processes: A Local Scale Study on Arsenic Sources and Release Mechanisms from a Volcanic Rock Matrix

Parrone

Ghergo

Preziosi

et al. 2022

Toxics

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Arsenic is a potentially toxic element (PTE) that is widely present in groundwater, with concentrations often exceeding the WHO drinking water guideline value (10.0 μg/L), entailing a prominent risk to human health due to long-term exposure. We investigated its origin in groundwater in a study area located north of Rome (Italy) in a volcanic-sedimentary aquifer. Some possible mineralogical sources and main mechanisms governing As mobilization from a representative volcanic tuff have been investigated via laboratory experiments, such as selective sequential extraction and dissolution tests mimicking different release conditions. Arsenic in groundwater ranges from 0.2 to 50.6 μg/L. It does not exhibit a defined spatial distribution, and it shows positive correlations with other PTEs typical of a volcanic environment, such as F, U, and V. Various potential As-bearing phases, such as zeolites, iron oxyhydroxides, calcite, and pyrite are present in the tuff samples. Arsenic in the rocks shows concentrations in the range of 17–41 mg/kg and is mostly associated with a minor fraction of the rock constituted by FeOOH, in particular, low crystalline, containing up to 70% of total As. Secondary fractions include specifically adsorbed As, As-coprecipitated or bound to calcite and linked to sulfides. Results show that As in groundwater mainly originates from water-rock interaction processes. The release of As into groundwater most likely occurs through desorption phenomena in the presence of specific exchangers and, although locally, via the reductive dissolution of Fe oxy-hydroxides.

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“…The subject of geothermal F is large enough to merit a separate paper which is being prepared. It should be noted, however, that the subject is of great importance to drinking water because when groundwater F is too high for drinking purposes, it is often caused by geothermal water leaking into an aquifer without an obvious increase in temperature (Armienta and Segovia, 2008;Carrillo-Rivera et al, 2002;Chae et al, 2007;Forrest et al, 2013;Murray, 1996b;Navarro et al, 2011;Parrone et al, 2020). A distinctive chemical feature of geothermal water is the associated elevation of Li, B, and As concentrations in addition to F (White, 1957).…”

Section: The Effect Of Temperature On Fluoride Concentrationsmentioning

confidence: 99%

Fluoride in Groundwater

Nordstrom¹,

Smedley²

2022

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Arsenic-fluoride co-contamination in groundwater: Background and anomalies in a volcanic-sedimentary aquifer in central Italy

Cited by 44 publications

References 46 publications

Fe and As geochemical self-removal dynamics in mineral waters: evidence from the Ferrarelle groundwater system (Riardo Plain, Southern Italy)

Fe and As geochemical self-removal dynamics in mineral waters: evidence from the Ferrarelle groundwater system (Riardo Plain, Southern Italy)

Water-Rock Interaction Processes: A Local Scale Study on Arsenic Sources and Release Mechanisms from a Volcanic Rock Matrix

Fluoride in Groundwater

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