Isabel Herrera

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Heavy metals from mining, smelting operations and other industrial processing facilities pollute wastewaters worldwide. Extraction of metals from industrial effluents has been widely studied due to the economic advantages and the relative ease of technical implementation. Consequently, the search for new and improved methodologies for the recovery of gold(More)
(MEDICAGO SATIVA): BATCH PH, TIME, TEMPERATURE, AND IONIC STRENGTH STUDIES 1 I. Herrera, 1,2 J.L. Gardea-Torresdey, 1 K.J. Tiemann, 2 J.R. Peralta-Videa, 1 V. Armendariz, and J.G. Parsons 1Department of Chemistry, 500 W. University Ave, University of Texas at El Paso, El Paso, TX 79968; Phone: (915)747-5359; Fax: (915)747-5748. 2Environmental Science and(More)
Humin extracted from Sphagnum peat moss was immobilized in a silica matrix and column experiments were performed in order to evaluate the removal and recovery of metal ions from aqueous solution under flow conditions. These experiments also allowed testing the recycling capacity of the column. Single-element solutions of Cu(II) and Pb(II), and a multi-metal(More)
Coffea arabica L. (arabica coffee), the only tetraploid species in the genus Coffea, represents the majority of the world's coffee production and has a significant contribution to Nicaragua's economy. The present paper was conducted to determine the genetic diversity of arabica coffee in Nicaragua for its conservation and breeding values. Twenty-six(More)
G. Gamez, K. Dokken, K.J. Tiemann, I. Herrera, M.J. Yacaman, M.W. Renner, L.R. Furenlid, and J.L. Gardea-Torresdey Department of Chemistry and Environmental Sciences and Engineering, University of Texas at El Paso, El Paso, TX 79968; Phone (915) 747-5359, Fax (915) 747-5748. Instituto Nacional de Investigaciones Nucleares, Amsterdam 46-202, Col. Hipodromo(More)
Alfalfa plants (Medicago sativa, Mesa variety) grown in a silt soil of pH 7.4±0.2, were exposed in separate batches to 100 ppm of Cr(VI), 500 ppm of Cd(ii), Cu(ii), Ni(ii), and Zn(li) at different growth stages. At the stage of four days after germination, all the metals, except Zn(li), had lethal effects to alfalfa seedlings. At 16 days, CR(VI) and Ni(ii)(More)
Biological systems have shown the ability to uptake heavy metal ions naturally from aqueous solutions. This feature makes likely the utilization of death biological biomass to remove hazardous heavy metal ions from contaminated waters. Previous studies have demonstrated that alfalfa biomass uptakes several heavy metal ions from aqueous solutions. To(More)
Atomic memories for flying photonic qubits are an essential ingredient for many applications like e.g. quantum repeaters. Verification of the coherent transfer of information from a light field to an atomic superposition is usually obtained using an optical read-out. In this paper we report the direct detection of the atomic coherence by means of atom(More)
Traditional methods used for the removal of heavy metals from the environment are in general expensive and potentially risky due to the possibility of hazardous byproducts generation. Recently, attention has been directed to development of alternative methodologies such as use of organic materials as biosorbents. These methods represent environmental(More)
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