Water contaminated by heavy metals is a risk to public health. This is the reason behind widespread research on water treatment oriented to removing metal ions. This research determined the intensity of adsorption of lead (Pb) by the Azolla caroliniana fern and its capacity to remove lead in synthetic waters. An atomic absorption spectrophotometer was used to determine the concentration of adsorbed lead. Langmuir isotherm graphs showed that the type of isothermal system was unfavorable for the four reactors used in the study (RL's greater than 1). On the other hand, Freundlich isotherm graphs showed the linear models of the kinetic behavior of lead adsorption by Azolla caroliniana for the four reactors and enabled us to determine that the best R2 and the highest adsorption intensity (n) of Pb (0,122) was achieved with reactor D (30 ppm Pb).

The objective of this research was to determine corrosion rate (Vcorr) iron ASTM A36, in solutions of sodiumx cyanide and thiourea. Further evaluate the effect of this electrochemical phenomenon in costs associated with gold leaching processes. The corrosion rate was determined in mm / year by polarization curves. Costs were determined by a cost analysis using synthetic indicators. The corrosion rate of iron ASTM A36 in sodium cyanide solutions in concentrations of 0.62 g / L; 0.80 g / L and thiourea solutions 0.96 g / L; 1.24 g / L was evaluated. The results show that the corrosion rate of the metal is slightly higher in the solution of thiourea 1.24 g / L (3.03 mm / year) with the following behavior: Thiourea 1.24g / L> Thiourea 0.96 g / L> Cyanide 0.80 g / L ≈ Cyanide 0.62 g / L. It was estimated that corrosion costs in gold leaching processes are between 4.78 and 5.20% of the...

En esta investigación se determinó la velocidad de corrosión (Vcorr) de hierro ASTM A36, en soluciones de cianuro de sodio en concentraciones de 0,62 g/L; 0,80 g/L y de tiourea 0.96 g/L; 1.24 g/L. Adicionalmente se evaluó el efecto de este deterioro en los costos asociados a procesos de lixiviación aurífera. La velocidad de corrosión se determinó en mm/año mediante curvas de polarización. Se realizó un análisis de costos utilizando indicadores sintéticos. Los resultados muestran que la velocidad de corrosión del metal es ligeramente mayor en la solución de tiourea 1,24 g/L (3,03 mm/año) con el siguiente comportamiento: corrosión de hierro ASTM A36 en Tiourea 1,24g/L > Tiourea 0,96 g/L > Cianuro 0,80 g/L ≈ Cianuro 0,62 g/L. Se pudo estimar que los costos por corrosión en los procesos de lixiviación aurífera se encuentran entre el 4,78 y 5,20% del capital para c...

Water contaminated by heavy metals is a risk to public health. This is the reason behind widespread research on water treatment oriented to removing metal ions. This research determined the intensity of adsorption of lead (Pb) by the Azolla caroliniana fern and its capacity to remove lead in synthetic waters. An atomic absorption spectrophotometer was used to determine the concentration of adsorbed lead. Langmuir isotherm graphs showed that the type of isothermal system was unfavorable for the four reactors used in the study (RL's greater than 1). On the other hand, Freundlich isotherm graphs showed the linear models of the kinetic behavior of lead adsorption by Azolla caroliniana for the four reactors and enabled us to determine that the best R2 and the highest adsorption intensity (n) of Pb (0,122) was achieved with reactor D (30 ppm Pb).