Iván Morales Arredondo

Universidad Nacional Autónoma de México | UNAM · Department of Natural Resources Institute of Geophysics

Arsenic and fluoride groundwater concentrations over national standards for drinking water were measured in the regional aquifer of Juventino Rosas, Guanajuato State, Central Mexico. Also anomalous temperature occurs in groundwater wells of the area. Concentrations of total dissolved solids, silica, and chloride are too low to indicate a geothermal...

A groundwater sampling campaign was carried out in the summer of 2013 in a low-temperature geothermal system located in Juventino Rosas (JR) municipality, Guanajuato State, Mexico. This groundwater presents high concentrations of As and F− and high Rn counts, mainly in wells with relatively higher temperature. The chemistry of major elements was in...

Los valores de fondo del agua subterránea, BGV (por sus siglas en ingles), de elementos riesgosos, pueden ser integrados como com-ponentes en las políticas de manejo del agua subterránea. Variaciones de los BGV en áreas rurales con actividad agrícola y en áreas urbanas con desarrollo industrial pueden ser referidas a procesos de contaminación del a...

Groundwater of geothermal systems of low temperature located in the Mexican Highlands is used as urban water supply due to water scarcity in the area. Juventino Rosas, Irapuato, Cuitzeo and Jocotitlan in Guanajuato and Mexico States, are some of the areas supplied with geothermal water. These aquifer systems are formed mainly by volcanic rocks of t...

Numerous groundwater wells in Mexico exceed the maximum allowable fluoride (F−) and arsenic (As) drinking water concentration requirements, posing an environmental and health risk to the population that relies solely on these wells for drinking water sources. Since encouraging results have been obtained utilizing native limestones to remove some to...

To explain the presence and spatial distribution of NO 3 ⁻ and N–NH 3 in the Aquifer of the Metropolitan Area of Mexico City (AMAMC), a hydrogeochemical and isotopic analysis using ¹³ C DIC (as well as the stable isotopes ¹⁸ O and ² H) in groundwater was conducted. This aquifer is located in an old closed lacustrine volcano-sedimentary basin; some...

Mexico has five high-temperature geothermal fields, three of which are located in an active volcanic arc known as the Trans-Mexican Volcanic Belt in central Mexico and the other two in the state of Baja California in northwestern Mexico. In the Trans-Mexican Volcanic Belt, there are numerous hot springs, many of which have not been studied yet. It...

Mine tailings are one of the primary contaminant sources of heavy metals and metalloids in the soil. Besides increasing the concentration of potentially toxic elements (PTEs), tailings may modify the edaphic conditions and decrease the buffer capacity of impacted soils. The influence of tailings may reach distances far from the impoundments dependi...

A hydro-geochemical characterization was conducted in the northern part of the Sonora River basin, covering an area of 9400 km2. Equipotential lines indicated that groundwater circulation coincided with the surface water flow direction. Based on the groundwater temperature measured (on average ∼21 °C), only one spring exhibited thermalism (51 °C)....

Drinking water with a high natural concentration of fluoride (F−) has serious consequences for the health of the rural population in the state of Guanajuato, Mexico, where the water contains levels of F− that are not allowed by national and international regulations (1.5 mg/L). This health problem is very common in multiple states throughout Mexico...

The intensive use of the Aquifer of the Metropolitan Zone of Mexico City (AMZMC) has increased the concentrations of some trace elements due to natural or anthropogenic sources, as the release of elements from the heterogeneous mixture of the volcanic rocks and/or alluvial clay deposits, which play a very important hydrogeological role in the behav...

The Valley of Celaya aquifer, located in one of the most important agricultural and industrial areas in central Mexico, has been extremely overexploited for several decades for agricultural, industrial, and municipal uses. The Celaya aquifer is a multilayer, composed of an open upper alluvial (sedimentary deposit) aquifer with inter-layers of late...

In this work, an isotopic analysis of δ18O, δ 13C, and NO3−concentrations was carried out to identify the origin and the processes related to the contamination of an aquifer located in the state of Guanajuato, Mexico. The research identified the possible sources of δ13C in groundwater. During groundwater flow, CO2 participates in different hydrogeo...

Thermal manifestations are commonly found in central Mexico as result of the volcanic activity originating from the formation of the Trans-Mexican Volcanic Belt during the Quaternary. The Rancho Nuevo hot spring is one of them that has not been described before with a discharge temperature near 92 °C. The goal of the present study is to provide geo...

This study was aimed at investigating the hydrogeochemical and isotopic characteristics of low-temperature hydrothermal springs in six study sites located in the eastern portion of the Trans-Mexican Volcanic Belt, in order to evaluate the source of the thermal water, rock-water interactions, and reservoir temperature. In addi-tion, based on this, p...

This study was conducted to identify the origin, hydrogeochemical processes and evolution of groundwater in a tectonic valley. This study was carried out with the aim of quantifying the proportions of groundwater flows contributing to the water chemistry abstracted in a zone of convergence favored by the presence of active faults. The study area is...

Radon is a radioactive gas that can migrate from soils and rocks and accumulate in indoor areas such as dwellings and buildings. Many studies have shown a strong association between the exposure to radon, and its decay products, and lung cancer (LC), particularly in miners. In Mexico, according to published surveys, there is evidence of radon expos...

The sub-province Bajío Guanajuatense is located in Central Mexico, is one of the most important agricultural areas in Mexico, where are used large volumes of water. The current panorama of Guanajuato shows an increase of more than three times in the use of groundwater, compared to extraction 30 years ago; this water is used to maximize crop yields;...

A hydrogeochemical and isotopic study was conducted in the western portion of the Celaya Valley Aquifer, Mexico, to assess the role of dissolved carbon dioxide in groundwater contamination. The partial pressure of carbon dioxide value is used to evaluate a complex hydrogeochemical environment, and the carbon dioxide behavior is used to identify the...

To evaluate the hydrogeochemical processes related to the presence, mobility, and transport of uranium and thorium in the southeastern Sierra de Guanajuato of the Bajio Guanajuatense, Mexico, the concentration of these elements in volcanic rocks and in groundwater were determined. Acidic volcanic rocks contained uranium concentrations of 1.04–6.88...

A study was carried out to estimate the level of fluoride exposure and the human health risk of developing dental and skeletical fluorosis in some of the villages in Santa Cruz de Juventino Rosas (JR), state of Guanajuato, Mexico. The study included a fluoride concentration analysis of groundwater samples from 23 wells during the years 2010 to 2016...

Two low-temperature geothermal systems located at the Trans-Mexican Volcanic Belt with presence of fluoride and arsenic were studied with the aim to determine hydrogeochemical indicators of the toxic elements' presence, and to propose adequate geothermometers. The hydrogeological and geochemical study was carried out in Ixtapan de la Sal and Tonati...

In order to understand the geological and hydrogeological processes influencing the hydrogeochemical behavior of the Cerro Prieto Geothermal Field (CP) aquifer, Mexico, a characterization of the water samples collected from geothermal wells was carried out. Different hydrochemical diagrams were used to evaluate brine evolution of the aquifer. To de...

The groundwater of low-temperature geothermal systems located in the Mexican Highlands is used as an urban water supply owing to water scarcity in the area. In the Juventino Rosas (JR) area, central Mexico, the highest well temperature is 50°C; most of the hot waters range from 24°C to 48°C. The aquifer systems are formed mainly by Oligocene-Plioce...

High concentrations of arsenic and fluoride were found in the groundwater of the aquifer system of Juventino Rosas, Guanajuato State, Central Mexico. Three monitoring campaigns (2012-2014) were carried out. 23 urban wells were sampled. The aquifer is hosted in alluvial-lacustrine sediments and volcanic rocks in interaction with fault and fracture s...

In central Mexico, there are many regions where groundwater contains As over the national standard for drinking water. In El Bajio, Guanajuato, the presence of arsenic could be linked to igneous rocks of different origin, to the local geothermal activity and to the presence of deep faults and fractures through which hot water rises. In the area, th...

Juventino Rosas inhabitants are supplied with groundwater extracted from the local aquifer system. Juventino Rosas is a small village located in Guanajuato State, in the Bajío Guanajuatense, in the central part of Mexico, at the boundary between the Central Mexican Plateau and the Mexican Volcanic Belt. The groundwater is the only water supply sour...