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Introduction
I investigate the sources, sinks, and mechanisms that control the distribution of inorganic chemical species at the Earth´s surface over a wide range of spatial and temporal scales.
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May 2005 - present
September 2009 - present
January 2005 - present
Publications
Publications (139)
The relationship between geomorphological features and water geochemistry was studied for a group of mountainous rivers (from ~ 900 to ~ 2200 m a.s.l.) with similar geology and climate, in the Sierras Pampeanas of Córdoba (Argentina, 31° 30′, 32° 00′S, and 64° 30′, 65° 10′W). A multivariate approach was used to identify three morphological domains...
The incorporation of magnesium (Mg), strontium (Sr), and arsenic (As) into calcium carbonate minerals (CaCO3) during precipitation is well documented. The formation of Ca‑carbonate with an aragonite-type structure is typically favoured at alkaline pH and high temperatures. However, aragonite has also been observed in As-rich environments under ambi...
The surface water - groundwater interactions in a small anthropically affected mountain watershed (Salsipuedes River) in Sierras Pampeanas (central Argentina) was analyzed and quantified by means of 222Rn mass balance modeling, and its implications in hydrochemistry and water quality was examined. Surface waters, springs and groundwater were sample...
World-class borate deposits often form from As-rich waters, this study addresses the understudied association of arsenic (As) species with evaporite borates, focusing on the Puna region's borate deposits (Central Andes of Argentina). The research aims to characterize the association between borate minerals and high As concentrations in brines and t...
Coastal wetland ecosystems are of utmost importance in regulating the mobility and distribution of elements in water and sediments, being the flooding by tidal events a recurrent process that strongly controls the hydrodynamics of the system. The aim of this work is to assess the control of the tidal regime and anthropogenic influence on the dynami...
La concentración de Fluoruro (F-) en el agua subterránea del estado de Guanajuato excede el límite permisible para consumo humano señalado por la normatividad nacional (1.5 mg/L). Desafortunadamente, la principal fuente de agua en Guanajuato proviene de los mantos acuíferos, por lo tanto, la población se encuentra expuesta a enfermedades asociadas...
The dynamics of B isotopes in the hypersaline Olaroz basin located in the Central Andes, was characterized by means of chemical and isotopic analysis (δ 11 B and 87 Sr/ 86 Sr) of brines, warm springs, rivers, evaporites, and regional rocks. The mineralogical composition of evaporites was determined by XRPD and SEM/EDS, while the fractionation of B...
The contamination of aquatic systems due to mining activities constitutes a great concern of the global mining industry, but only a few studies have specifically addressed the impact of Li-pegmatite mining on water quality. In order to provide data on this type of systems, we assessed the impact of mining activities carried out in a lithium-rich pe...
Andean volcanic rocks typically have low to moderate arsenic (As) concentrations.
However, elevated levels of As in groundwaters of southern South America have been
reported as a consequence of weathering of volcanic glass. This study discusses the
abundance, speciation and dispersion of As species in fresh volcanic ash from highly
explosive (Volca...
Dry lakebeds exposed by shrinking water bodies in arid regions constitute sodium (Na)‐rich mineral dust emission hotspots that may potentially affect agriculture through soil sodification. However, no soluble Na mass balance has so far been attempted. We modeled 13 years (2005–2017) of dust emission from Mar Chiquita (MC), the most extensive shrink...
The interaction of geogenic arsenic (As) with carbonate minerals depends on the biological and geochemical conditions of the environment. This study sheds light on how different environmental conditions influence the carbonate mineral formation and the interaction with As. Three different samples were analyzed: carbonates associated with thermal sp...
The chemistry of rainwater is controlled by the interaction among water, airborne particles and gas sources, whether natural or human-made. This article analyzes the chemical composition dynamics of individual rainfall events collected over a three-year period in the densely populated city of C´ordoba (Argentina). The main purpose
is to identify th...
The evaporation of As-rich leachates generated by the weathering of sulfide-rich mine wastes accumulated in abandoned tailing dams of the La Concordia mine, triggers the widespread precipitation of saline crusts and efflorescences. Because these salts are highly soluble, they may release high concentrations of arsenic after rainfall events. Thus, t...
El premio Nobel de química del año 2019 fue para tres investigadores que
desarrollaron las baterías de ion litio. Estas baterías, que son más livianas y
eficientes, permitieron promover la industria electrónica de gran consumo y
crearon las condiciones para liberar a las sociedades de los combustibles
fósiles. Argentina es el tercer productor mundi...
Fresh volcanic ash samples collected during the eruptions of the Hudson (1991), Chaitén (2008), Puyehue (2011), Calbuco (2015) and Copahue (2016) volcanoes were analyzed in order to identify the fluorine (F) bearing phases. XPS and HR-TEM was used to determine the solid speciation of F. In order to decrease the surface differential charging of samp...
The Salar de Olaroz is one of the main Li operations in Argentina. In
order to identify sources and to understand the dynamics of Li in this salt pan, chemical and isotopic analysis (7Li and 87Sr/86Sr) of brines, thermal and river waters, as well as ignimbrites and sediments that outcrop in the basin were performed. The Li concentrations in shallo...
Los procesos que controlan la retención de Litio en los sedimentos más modernos del salar de Olaroz, son aún desconocidos. Se propone identificar las fases portadoras de Li y los procesos que controlan su distribución entre la fase sólida y las salmueras en los sedimentos superficiales (~0.7 m) del salar de Olaroz. La composición química tanto de s...
Resumen Las eflorescencias salinas se distribuyen ampliamente en el pasivo ambiental de la Mina Concordia y representan sumideros importantes de As y de metales pesados. En este trabajo se propone determinar la especiación de As en los minerales presentes en estas eflorescencias, así como identificar la presencia de minerales portadores de metales...
Purpose: The concentrations and distribution of arsenic (As) in two different soil types (Vertisols and Entisols) of Central Mexico impacted by mine activities and irrigation with As-rich groundwater are analyzed in order to determine their impact on the soil quality, and to contribute reliable data that may help to assess the environmental risk th...
This paper describes the weathering processes that occurred across two tailing dumps in the Concordia mine (Puna of Argentina) with the purpose of evaluating the formation of secondary As-bearing minerals due to arsenopyrite alteration. After 30 years of exposure, the gradual oxidation of the wastes produced a number of secondary mineral phases con...
Subtropical laterites are partially found in the Argentinian province of Misiones, covering the Jurassic-Cretaceous Serra Geral flood basalts (known as Posadas Formation in Argentina). Two hypotheses have been proposed to explain the origin of these laterites. The autochthonous theory attributes the origin of these deposits to the chemical weatheri...
Palabras clave: LITIO, SALAR, OLAROZ, SALMUERA. El 70% de las reservas de Li identificadas a nivel global se encuentran en una región de la Puna-Altiplano denominada el "triángulo del Li". En este trabajo se presentan datos geoquímicos y mineralógicos obtenidos en el salar de Olaroz (24º05´S-66º40´O), ubicado en esta importante región de los Andes...
The sulphide-rich mine wastes accumulated in tailing dumps of La Concordia Mine (Puna of Argentina) have been exposed to the weathering action for more than 30 years. Since then, a series of redox reactions have triggered the generation of a highly acidic drainage -rich in dissolved metals-that drains into the La Concordia creek. The extent of meta...
Salars of the Andean Plateau in the Central Andes are the largest lithium deposits on Earth. The most notorious are the Chilean Salar de Atacama, and Uyuni in the Bolivian Altiplano. Despite the relevance of the region concerning the lithium resources, there is still scarce scientific literature on the hydrochemistry of lithium deposits in the Arge...
X-ray absorption spectroscopy (XAS) was used to determine the oxidation state of As, local chemical coordination and the relative proportion of different As species in recent and ancient Andean volcanic ashes, as well as in Chaco Pampean loess. As K edge XANES analysis indicates that in loess sediments the dominant species is As(V) (i.e., >91%). Co...
The coastal plain of the middle estuary of the Río de la Plata is a highly industrialized area and is densely populated by sectors. The main human activity in the sector encompassed between the cities of Ensenada and Berisso is associated with the petrochemical industry. In this work, hydrogeochemical and isotopic characteristics of surface and gro...
El agua es un fluido de proceso de mucha importancia en Tecnología Nuclear. La Unidad de Actividad Química (UAQ) ha dedicado mucho esfuerzo al estudio de sus propiedades fundamentales y de sus aplicaciones, con miras a optimizar el funcionamiento de los sistemas refrigerante, moderador y auxiliares en Centrales Nucleares. Uno de los aspectos fundam...
The Salar de Olaroz is part of the Olaroz-Cauchari closed-basin, set in a submeridional-enlogated tectonic depression in northern Argentinean Puna. It constitutes a saline system of great economic interest due to the high concentrations of Li, B and K of its brines. The sub-basin of the Salar de Olaroz (24º05´S-66º40´W; 3950 m a.s.l.) occupies an a...
The study area involves the Guayatayoc Basin, an endorheic basin with a surface of ~ 17000 km2 and located along the eastern Puna of Jujuy. The low lying area (3400 m a. s. l.) of this basin includes a ~400 km² playa lake system. The western catchment area corresponds to the Las Burras Sub-basin, which involves the Coranzuli and Pastos Chicos River...
The aim of this work was to present the preliminary results of a Sequential Extraction Procedure (SEP) applied to the loess sediments from two study sites in the Pampean plain of Argentina. It consists in a combined SEP methodology based on Keon et al. (2001) and Dold (2003) procedures. Since mobile arsenic is associated only with some mineral phas...
The sulfide-rich residues of La Concordia mine, Argentina Puna, are accumulated in tailing dams that remained exposed to the weathering agents for almost 30years. In such period of time, a complex sequence of redox and dissolution/precipitation reactions occurred, leading to the gradual oxidation of the wastes and the formation of weathering profil...
The Paraná River basin is one of the largest hydrological systems in South America (�2.6 � 106 km2).
Downflow the confluence of tributaries, most large rivers exhibit transverse and longitudinal inhomogeneities
that can be detected for tens or even hundreds of kilometers. Concordantly, a noticeable
cross-sectional chemical asymmetry in the dissolve...
Patagonia, due to its geographic position and the dominance of westerly winds, is a key area that contributes to the supply of nutrients to the Southern Ocean, both through mineral dust and through the periodic deposits of volcanic ash. Here we evaluate the characteristics of Fe dissolved (into soluble and colloidal species) from volcanic ash for t...
An estimated 70 million people around the world suffer from fluorosis due to chronic exposure to high levels of fluoride in drinking water. The sources of this element in water are mostly geogenic, although important contributions also come from industrial activities and coal burning. Fluorine is the 13th more abundant element in the earth’s crust,...
The main carrying phases of mercury (Hg) were analyzed in a 120 cm sediment core taken at the Laguna del Plata (LP), a small lake connected to the main water body of Laguna Mar Chiquita (LMC) during highstands. LMC is considered to be one of the largest saline lakes in the world representing a sensitive climatic indicator due to its frequent lake l...
The sources and dynamics of arsenic in fresh volcanic ashes collected during the eruptions of
Hudson (1991) and Puyehue (2011) volcanos, have been studied. The chemical and mineralogical
compositions of both volcanic ashes were analyzed by ICP/OES, DRX, and SEM-EDS. Batch experiments
were conducted to evaluate the kinetics of the arsenic release un...
In the Argentina Puna region there are several metal sulfide mines that ceased their activity twenty years ago without a proper closure plan. The exposure of the waste rocks and tailing impoundments to weathering led to sulfide oxidation and generation of highly acid solutions rich in metal(oid)s, that react with the unaltered waste rocks, partitio...
We have examined the sources and mechanisms that control the release of fluoride and arsenate from fluvial and loess sediments collected from the Chacopampean region, Argentina. The two types of sediment show slight differences regarding the mechanism of release. In fluvial sediments the release of fluoride seems to be controlled by the dissolution...
En este trabajo se analiza la variación en las concentraciones de mercurio, las fases portadoras del mismo y los flujos de este elemento producidos en la Laguna del Plata, en la región central de Argentina, en los últimos 80 años, aproximadamente. Para ello se realizaron análisis químicos, mineralógicos, sedimentológicos y dataciones radiométricas...
The main carrying phases of mercury (Hg) were analyzed in a 120 cm sediment core taken at the Laguna del Plata (LP), a small lake connected to the main water body of Laguna Mar Chiquita (LMC) during highstands. LMC is considered to be one of the largest saline lakes in the world representing a sensitive climatic indicator due to its frequent lake l...
We analyze the sources and mechanisms that control the release of fluoride from sediments collected from two types of aquatic reservoirs in the central region of Argentina: 1) mountainous rivers draining crystalline rocks from the Sierras Pampeanas ranges, and 2) shallow aquifers in loessic sediments. The assessment was performed on the basis of ex...
La geometría fractal es una valiosa herramienta para la descripción y el estudio de objetos y sistemas naturales que no pueden ser descriptos mediante la geometría euclidiana. En este trabajo se determinó la dimensión fractal de los agregados coloidales (fracción < 0,45 μm) transportados por el río Paraná en su tramo medio. El contenido coloidal fu...
Se analizó la distribución y variabilidad de los elementos de tierras raras (ETR) en aguas y sedimentos suspendidos del río Paraná medio. Se tomaron muestras de agua a diferente profundidad a lo largo de tres transectas perpendiculares al río: Corrientes-Resistencia, Goya-Reconquista y Paraná-Santa Fe. Todas las muestras de agua presentan un patrón...
Symptoms of dental fluorosis have been observed in rural communities located in the Sierras Pampeanas de Córdoba, a mountainous area in Central Argentina. The clinical assessment was performed in the Charbonier Department, where the fluoride (F -) intake was determined to be 3.90 ± 0.20 mg day -1 (n = 16). In this community, mild and severe fluoros...
Resumen: Las Sierras Pampeanas de Córdoba constituyen un sitio importante para el estudio de sistemas hídricos por su importancia socio-económico-cultural. Allí se originan redes de drenajes muy importantes que proveen agua potable a la población del este y del oeste de las sierras. Litológicamente el área de estudio está representada por granitoid...
We propose a model that explains the acid–base surface properties of clastic sediments from two Argentinean reservoir lakes.
The model uses potentiometric titration data sets and fixed parameters such as the apparent stability constants and reaction
stoichiometries of acid–base equilibriums involving known mineral phases. The model considers that s...
In the southern part of the province of Tucumán (northwestern Chaco-Pampean
plain), several wells show intermediate to high concentrations of arsenic (As) (between 26 and
76 μg/l) and high concentrations of fluoride (F−) (between 0.6 and 6.0 mg/l). These wells
penetrate saturated layers as deep as 500 m.b.s., and show groundwater temperatures above...
En la presente contribución se da a conocer la Carta de Líneas de Base Ambiental correspondiente
a la Hoja San Miguel de Tucumán (2766-II, escala 1:250.000), que fue realizada durante los años 2006
y 2007 siguiendo la normativa del SEGEMAR del año 1997 para este tipo de cartografía. La Hoja
Concepción se encuentra comprendida entre los meridianos 6...
Stream waters draining granitic terrains from the highest part (850 to 2200 m a.s.l.) of Sierras Pampeanas (Córdoba, Argentina, ∼32°S, ∼65°W) were sampled in order to define sources and distribution of dissolved rare earth elements (REE), and to describe the geochemical processes that govern their mobility. The contribution of the regional granite...
The concentration of arsenic measured in groundwater from three aquifers in the study area located in the Eastern Tucuman
province, Argentina, mostly depends on the lithology, but the spatial and temporal variations of concentrations seem to be
also controlled by pH changes, climatic factors, and human perturbations. The highest concentrations of A...
Name: Uncultured marine bacterium, DGGE band 3, 16S rRNA gene, partial sequence.
