A5048222134- Karst Systems and Hydrogeology
- Groundwater flow and contamination studies
- Groundwater and Isotope Geochemistry
- Geophysical Methods and Applications
- Soil and Unsaturated Flow
- Grouting, Rheology, and Soil Mechanics
- Groundwater and Watershed Analysis
- Toxic Organic Pollutants Impact
- Effects and risks of endocrine disrupting chemicals
- Geological and Geophysical Studies Worldwide
- Microwave Imaging and Scattering Analysis
- Radioactivity and Radon Measurements
- Graphite, nuclear technology, radiation studies
- Soil Moisture and Remote Sensing
- Subterranean biodiversity and taxonomy
- Hydrology and Watershed Management Studies
- Electrokinetic Soil Remediation Techniques
- Geology and Paleoclimatology Research
- Analytical chemistry methods development
- Fecal contamination and water quality
- Radioactive contamination and transfer
- Arsenic contamination and mitigation
- Mass Spectrometry Techniques and Applications
- Mineral Processing and Grinding
- Environmental remediation with nanomaterials
University of Puerto Rico-Mayaguez
2016-2025
University of Puerto Rico System
2010-2022
West Virginia University
2022
University of Washington
2022
University of Puerto Rico, Medical Sciences Campus
2018
University of Arizona
1999
Hospital General Universitario de Alicante Doctor Balmis
1990
The effect of water content on NaCl transport in unsaturated porous media was investigated under steady state flow conditions for contents ranging between full saturation and 15% by volume. experiments were conducted a 25 cm column packed with homogeneous sand. Results the indicate that solute is subject to greater velocity variations slower mixing than one saturated media. As result, breakthrough curves (BTCs) show earlier initial arrival tailing variance as average decreases. These results...
Karst aquifers have a high degree of heterogeneity and anisotropy in their geologic hydrogeologic properties which makes predicting behavior difficult. This paper evaluates the application Equivalent Porous Media (EPM) approach to simulate groundwater hydraulics contaminant transport karst using an example from North Coast limestone aquifer system Puerto Rico. The goal is evaluate if EPM approach, approximates features with conceptualized, equivalent continuous medium, feasible for actual...
This study performed a comprehensive assessment of the impact Hurricane Maria (HM) on drinking water quality in Puerto Rico (PR) by integrating targeted chemical analysis both inorganic (18 trace elements) and organic pollutants (200 micropollutants) with high-throughput quantitative toxicogenomics vitro biomarkers-based toxicity assays. Average concentrations 14 detected elements 20 micropollutants showed elevation after HM. Arsenic, sucralose, perfluorooctanoic acid (PFOA),...
This article presents an overview of our research team's disaster response to the massive destruction Hurricanes, Irma and Maria, in September 2017, light 120-year colonial legacy long-term, widespread environmental contamination Puerto Rico. Both local federal governmental responses have been extremely inadequate, especially long-standing issues throughout island. Community organizations Rico fighting for justice decades, often succeeding, always confronting government unwillingness address...
Abstract. Karst systems are characterized by a high subsurface heterogeneity, and their complex recharge processes difficult to characterize. Experimental methods study karst mostly focus on analysing the entire aquifer. Despite important role in processes, soil epikarst receive limited attention, few available studies were performed at sites of similar latitudes. In this paper, we describe new monitoring network that allows for improvement understanding including different with land-cover...
A novel reactive electrochemical flow system consisting of an iron anode and a porous cathode is proposed for the remediation mixture contaminants in groundwater. The consists series sequentially arranged electrodes, perforated anode, copper followed by mesh-type mixed metal oxide anode. generates ferrous species chemically reducing environment, provides electrochemically barrier, inert protons oxygen to neutralize system. redox conditions electrolyte flowing through this can be regulated...
A pilot-scale expanded target assessment of mixtures inorganic and organic contaminants in point-of-consumption drinking water (tapwater, TW) was conducted Puerto Rico (PR) to continue inform TW exposures corresponding estimations cumulative human-health risks across the US. In August 2018, a spatial synoptic pilot than 524 37 chemicals 14 locations (7 home; 7 commercial) PR. follow-up 3-day temporal variability December 2018 at two (1 home, 1 included daily pre- post-flush samples....
The performance of electrochemical remediation methods could be optimized by controlling the physicochemical conditions redox system. effects anode type (reactive or inert), current density and electrolyte composition on temporal changes in pH potential were evaluated divided mixed electrolytes. Two types electrodes used: iron as a reactive electrode metal oxide coated titanium (MMO) an inert electrode. Electric currents 15, 30, 45 60 mA (37.5 L−1, 75 112.5 L−1 150 L−1) applied. Solutions...
Abstract Karst aquifers are highly productive groundwater systems often associated with conduit flow. These can be vulnerable to contamination, resulting in a high potential for contaminant exposure humans and ecosystems. This work develops statistical models spatially characterize flow transport patterns karstified limestone determines the effect of aquifer rates on these patterns. A laboratory‐scale Geo‐ HydroBed model is used simulate processes karstic unit. The consists stainless steel...
Loss of basic utilities, such as drinking water and electricity distribution, were sustained for months in the aftermath Hurricane Maria's (HM) landfall Puerto Rico (PR) September 2017. The goal this study was to assess if there deterioration biological quality due these disruptions. This characterized microbial composition following HM across nine systems (DWSs) PR utilized an extended temporal sampling campaign determine changes microbiome indicative associated disturbance followed by...