Arsenic, lead, and uranium concentrations on sediments deposited in reservoirs in the Rio Grande Basin, USA–Mexico border

Méndez-García, C.; Luna-Porres, Mayra Y.; Montero-Cabrera, M. E.; Rentería-Villalobos, Marusia; Pérez-Cázares, Bernardo; Garcı́a-Tenorio, R.

doi:10.1007/s11368-016-1400-y

Cited by 10 publications

(5 citation statements)

References 47 publications

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“…The μ-XANES As K-edge spectra have shown that As is adsorbed on ferrihydrite. Finding this contaminant does not come as a surprise: it is a common pollutant of Northern Mexico groundwater. , Thus, it can be presumed that its presence originates from natural sources, if not from the early stages, at least during the final stage of crystal growth.…”

Section: Resultsmentioning

confidence: 99%

Naica’s Giant Crystals: Characterization and Evolution of the Wall–Crystal Interface

Pérez-Cázares

Fuentes-Montero

Fuentes-Cobas

et al. 2021

Crystal Growth & Design

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Naica’s “Cueva de los Cristales” (Cave of the Crystals) has been compared to the most beautiful places of worship for the incredible display of columns that populate its vault. Said columns are giant gypsum crystals that have already been the subject of extensive studies. This paper contributes to these studies by focusing on the mineral aggregates found at the wall–selenite interface. A detailed chemical and structural characterization of representative samples has been performed using chemical, mineralogical, elemental, and phase analysis methods, with an emphasis on synchrotron micro-spectroscopic techniques. The following main phases were identified: calcite, silica, goethite, and several Pb-, Mn-, Cu-, and Zn-based aggregates. The role of the mineral aggregates, from their potential incorporation at the very beginning of the formation to the final steps of the crystals’ growth, is investigated. Particular attention is paid to their shapes and composition. The data obtained on the morphology of the wall–crystal interface and related phase composition, together with classical nucleation formalisms based on the slightly supersaturated solution, suggest that the nanocrystalline monomers formed in solution undergo adsorption on the wall, which ultimately promotes mega crystal growth.

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Section: Resultsmentioning

confidence: 99%

Naica’s Giant Crystals: Characterization and Evolution of the Wall–Crystal Interface

Pérez-Cázares

Fuentes-Montero

Fuentes-Cobas

et al. 2021

Crystal Growth & Design

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“…Finally, an alpha-spectrometer (Alpha analyst, CANBERRA) was used for isotopic U measurements. The uranium activity concentrations were calculated by equation (1) proposed by Kumar et al [21].…”

Section: Procedures One (P1)mentioning

confidence: 99%

“…Then the sample followed the same treatment that procedure one: tracer addition, actinide precipitation with Fe +3 solution, U extraction with TBP, electrode position and alpha-spectrometry counting. Isotopic U was calculated by equation (1).…”

Section: Procedures Two (P2)mentioning

confidence: 99%

“…Arid zones are those with mean annual precipitation less than 350 mm [1]. These areas are characterized by water scarcity, erratic, and torrential distribution of rainfall, as well as the intensive use of water for economic activities.…”

Section: Introductionmentioning

confidence: 99%

“…The activity of U was counting by PERALS spectrometer (Oak Ridge TN, EUA). Isotopic U was calculated by equation(1).…”

mentioning

confidence: 99%

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Hydrochemistry and Uranium Concentration in Brackish Groundwater from an Arid Zone, Chihuahua, Mexico

Rentería-Villalobos

Mendieta-Mendoza

Montero-Cabrera

et al. 2021

J. Nucl. Phy. Mat. Sci. Rad. A.

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In arid zones, the principal water supply is from groundwater, which can present high concentration of salts, heavy metals, and radioactive elements. The aim of the study was to determine isotopic uranium concentration in groundwater samples with high concentration of salts and its association with other chemical species. Samples were taken from wells with high salt content. The 238,234U radioisotope concentrations were determined by liquid scintillation and alpha-particle spectrometry. In addition, the physical-chemical parameters were recorded in situ; whereas the dissolved ions and elemental composition were measured by UV-Vis and X-ray fluorescence spectrophotometry, respectively. To obtain isotopic uranium concentrations, three radiochemistry procedures were carried out. An ANOVA test was performed to compare the results from procedures, as well as an analysis of Pearson correlation was used between parameters to obtain their associations. Statistically, the U isotopic concentrations did not show differences (p-value 0.82) between procedures. 238U and 234U showed mean concentrations of 6.7 mBq mL-1 and 16.6 mBq mL-1, respectively, with an Activity Ratioby up 7.2. The groundwater under study showed high concentration of TDS, calcium, sulphate, chloride, nitrate, and nitrite. Isotopic U concentrations tend to increase with NO3>Zn>Cl>Br>SO4>Cu>T>SDT>P; meanwhile their contents decrease with T>Cl->NO2>Fe. These findings help us to understand the uranium behavior in groundwater with high salt contents as well as the influence of agricultural supplies on chemical species presents in groundwater.

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Anthropogenic and climate induced trace element contamination in a water reservoir in northwestern Mexico

Ochoa-Contreras

Jara-Marini

Sanchez-Cabeza

et al. 2021

Environ Sci Pollut Res

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Arsenic, lead, and uranium concentrations on sediments deposited in reservoirs in the Rio Grande Basin, USA–Mexico border

Cited by 10 publications

References 47 publications

Naica’s Giant Crystals: Characterization and Evolution of the Wall–Crystal Interface

Naica’s Giant Crystals: Characterization and Evolution of the Wall–Crystal Interface

Hydrochemistry and Uranium Concentration in Brackish Groundwater from an Arid Zone, Chihuahua, Mexico

Anthropogenic and climate induced trace element contamination in a water reservoir in northwestern Mexico

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