Spatial distribution of arsenic, uranium and vanadium in the volcanic-sedimentary aquifers of the Vicano–Cimino Volcanic District (Central Italy)

Cinti, D.; Poncia, Pier Paolo; Brusca, L.; Tassi, Franco; Quattrocchi, F.; Vaselli, Orlando

doi:10.1016/j.gexplo.2015.02.008

Cited by 59 publications

(38 citation statements)

References 40 publications

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“…The highest values are in an area elongated in a NW-SE direction, and can be explained through the complexity of the hydrostratigraphy and structural setting of the area and the related mixing phenomena occurring between water circulating in the basal volcanic aquifer and the fluids rising from depth that characterize the active hydrothermal system (Figure 3). This is in agreement with previous studies [12,17,18] and with maps of heat flow anomaly [21] and neotectonic and volcano-tectonic structures [28,31,32]. What arises from the present study by relating the content of arsenic in groundwater with the nature of the saturated basal aquifer is that in the NW-SE areas groundwater flow occurs mainly into the Vico volcanics, as was highlighted by the analysis of the potentiometric morphology and of the saturated aquifer (Figure 2a,b).…”

Section: Discussionsupporting

confidence: 94%

“…The distribution of the geogenic contaminant was explained through the complexity of the hydrostratigraphy, the structural setting of the area, and the related mixing occurring between water circulating in the basal volcanic aquifer and the fluids that rise from depth, all of which characterize the active hydrothermal system. A recently published study [12], still based on chemical analysis of groundwater, has reached the same conclusions.…”

Section: Introductionsupporting

confidence: 60%

“…For these resources, a low fluoride content is also expected, another element that often exceeds the permissible value in the area concerned, fluoride being strongly correlated with arsenic [17]. Moreover, in the cold waters of the Cimino-Vico area, characterized by oxidizing conditions, the predominant species is the pentavalent As(V), which is mainly present as aqueous complex (HAsO4 2− and H2AsO4 − ) [12] and which represents the less toxic form of As.…”

Section: Discussionmentioning

confidence: 99%

“…This is related to the presence of the element as a minor constituent of volcanic gases and geothermal fluids and to the leaching of rocks containing the element as a minor constituent [1][2][3][4]. The presence of arsenic in groundwater of the volcanic areas of central and southern Italy has been documented for about thirty years [5][6][7][8][9][10][11][12][13][14][15][16]. These studies show that several factors control the arsenic mobility in groundwater, such as water temperature, host-rock composition, water chemistry, and the influence of magma-derived volatiles.…”

Section: Introductionmentioning

confidence: 99%

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An Integrated Approach to Identify Water Resources for Human Consumption in an Area Affected by High Natural Arsenic Content

Armiento

Baiocchi

Cremisini

et al. 2015

Water

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This study concerns the occurrence of arsenic in the groundwater system of the Cimino-Vico volcanic area (central Italy), different parts of which are currently widely used for local drinking water supply and for irrigation. The system shows a complex groundwater circulation, including a continuous basal aquifer, discontinuous perched aquifers, groundwater flows at high altitude, and local interactions with rising thermal fluids. Data on arsenic contents in 250 water samples from springs and wells and in 68 samples from rock outcrops were measured and combined with already existing information. Results highlight that arsenic concentrations of groundwater are influenced by type of aquifer, groundwater flow path, arsenic content of the aquifer rocks, and interaction with fluids rising from depth. Waters circulating in the Vico volcanics, one of the prominent rock units of the area, have high concentrations of arsenic, both for the basal OPEN ACCESSWater 2015, 7 5092 and the perched aquifers. A large fraction of the waters associated with this rock unit have arsenic contents higher than 10 μg/L (82 percent for basal, 40 percent for perched). In contrast, waters circulating in the Cimino volcanics have lower arsenic contents: 30 percent of the basal and 10 percent of the perched aquifers have arsenic concentrations greater than 10 μg/L. Through an integrated approach, including leaching tests to investigate the arsenic behavior concerning the water-rock interaction and a geostatistical modeling of data, it has been possible to identify and tentatively quantify suitable water resources that have arsenic content not exceeding the quality standards for human consumption.

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Section: Discussionsupporting

confidence: 94%

Section: Introductionsupporting

confidence: 60%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An Integrated Approach to Identify Water Resources for Human Consumption in an Area Affected by High Natural Arsenic Content

Armiento

Baiocchi

Cremisini

et al. 2015

Water

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“…Aiuppa et al, 2006;Kaasalainen and Stefánsson, 2012;Wilson et al, 2012;Göb et al, 2013). For example, relatively high As concentrations, comparable to those of the present study, characterize thermal waters from central Italy and were interpreted as due to the structurally controlled uprising of deep-originated fluids (Cinti et al, 2015). However, anomalously high As and Sb concentrations were also measured in those waters whose chemistry mostly depended on dissolution of salts at the surface (O1 and V1).…”

Section: Processes Controlling the Chemistry Of Waterssupporting

confidence: 81%

Fluid geochemistry of a deep-seated geothermal resource in the Puna plateau (Jujuy Province, Argentina)

Arnold

Cabassi

Tassi

et al. 2017

Journal of Volcanology and Geothermal Research

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This study focused on the geochemical and isotopic features of thermal fluids discharged from five zones located in the high altitude Puna plateau (Jujuy Province between S 22°20′-23°20′ and W 66°-67°), i.e. Granada, Vilama, Pairique, Coranzulí and Olaroz. Partially mature waters with a Na + -Cl − composition were recognized in all the investigated zones, suggesting that a deep hydrothermal reservoir hosted within the Paleozoic crystalline basement represents the main hydrothermal fluid source. The hydrothermal reservoirs are mainly recharged by meteoric water, although based on the δ 18 O-H 2 O and δD-H 2 O values, some contribution of andesitic water cannot be completely ruled out. Regional S-oriented faulting systems, which generated a horst and graben tectonics, and NE-, NW-and WE-oriented transverse structures, likely act as preferentially uprising pathways for the deep-originated fluids, as also supported by the Rc/Ra values (up to 1.39) indicating the occurrence of significant amounts of mantle He (up to 16%). Carbon dioxide, the most abundant compound in the gas phase associated with the thermal waters, mostly originated from a crustal source, although the occurrence of CO 2 from a mantle source, contaminated by organic-rich material due to the subduction process, is also possible. Relatively small and cold Na + -HCO 3 − -type aquifers were produced by the interaction between meteoric water and Cretaceous, Palaeogene to Miocene sediments. Dissolution of evaporitic surficial deposits strongly affected the chemistry of the thermal springs in the peripheral zones of the study area. Geothermometry in the Na-K-Ca-Mg system suggested equilibrium temperatures up to 200°C for the deep aquifer, whereas lower temperatures (from 105 to 155°C) were inferred by applying the H 2 geothermometer, likely due to re-equilibrium processes during the thermal fluid uprising within relatively shallow Na-HCO 3 aquifers. The great depth of the geothermal resource (possibly N 5000 m b.g.l.) is likely preventing further studies aimed to evaluate possible exploitation, although the occurrence of Liand Ba-rich deposits associated may attract financial investments, giving a pulse for the development of this remote region.

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Nonparametric construction of probability maps under local stationarity

García-Soidán

Menezes

2017

Environmetrics

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The environmental contamination risk can be evaluated in a specific area by approximating the probability that the pollutant under study exceeds a critical value. This issue requires the estimation of the distribution function involved, which can be addressed by applying the indicator kriging methodology or by approximating the sill of the variogram of the underlying indicator process. These approaches demand an appropriate characterization of the indicator variogram, which in turn requires a previous specification of the trend function, if the latter is suspected to be nonconstant. Because accuracy of the results will be strongly dependent on the adequate approximation of both functions, we suggest proceeding in a different way to avoid these requirements. Thus, in this paper, two kernel‐type estimators are proposed, on the basis of first approximating the distribution at the sampled sites and then obtaining a weighted average of the resulting values, to derive a valid estimator at each (sampled or unsampled) location. Consistency of the kernel approaches is proved under rather general conditions, such as local stationarity and the existence of derivatives up to the second order of the distribution function. Numerical studies have been carried out to illustrate the performance of our proposals when compared to those procedures requiring the approximation of the indicator variogram. In a final step, the kernel‐type estimation of the distribution function has been applied to map the risk of contamination by arsenic in the Central Region of Portugal. With this aim, biomonitoring data of arsenic concentrations were used to detect those zones with higher risk of arsenic accumulation, which is mainly located on the northern part of the region.

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Spatial distribution of arsenic, uranium and vanadium in the volcanic-sedimentary aquifers of the Vicano–Cimino Volcanic District (Central Italy)

Cited by 59 publications

References 40 publications

An Integrated Approach to Identify Water Resources for Human Consumption in an Area Affected by High Natural Arsenic Content

An Integrated Approach to Identify Water Resources for Human Consumption in an Area Affected by High Natural Arsenic Content

Fluid geochemistry of a deep-seated geothermal resource in the Puna plateau (Jujuy Province, Argentina)

Nonparametric construction of probability maps under local stationarity

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