Modificación de electrodos de carbón vítreo con nanotubos de carbono para determinación de metales en solución
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Fecha
2016
Profesor/a Guía
Facultad/escuela
Idioma
es
Título de la revista
ISSN de la revista
Título del volumen
Editor
Universidad Andrés Bello
Nombre de Curso
Licencia CC
Licencia CC
Resumen
El cobre es uno de los elementos metálicos más comunes que se encuentran dentro de nuestras aguas y tierras. Es uno de los metales cupríferos más importantes dentro de la industria minera sobre todo en nuestro país. Las aguas de desecho que generan las industrias (RILes), se caracterizan por contener grandes cantidades y concentraciones de elementos contaminantes, los cuales tienen un efecto perjudicial sobre el medio ambiente y la salud de los seres vivos que habitan la zona.
La química analítica, a través de la técnica de voltamperometría cíclica nos permite determinar la presencia de cobre en muestras de agua, pero esta detección del se encuentra directamente relacionada con una alta concentración del metal en la muestra. Es en base a este problema que se genera la siguiente unidad de investigación, en búsqueda de mejorar un método de análisis químico en el cuál se puedan detectar y determinar la existencia de cobre en muestras de agua, incluso si este se encuentra en bajas concentraciones, esto a través de la modificación de GCE con MWCNTs. Los MWCNTs cuentan con propiedades únicas, las cuales, al momento de la modificación, aumentan y potencian la sensibilidad del GCE. A través del trabajó experimental se determinaron las condiciones de modificación ideal, además del agente dispersante indicado para la determinación del metal en muestras de agua.
La modificación se llevó a cabo con cuatro diferentes solventes: H2O Milli-Q, DMF, CTAB y SDS, los cuales fueron utilizados para dispersar los MWCNTs, los cuales son completamente insolubles. La determinación del agente dispersante ideal y las condiciones de modificación adecuadas fueron determinadas a partir del estudio y evaluación de los parámetros de repetitividad, reproducibilidad y selectividad. Bajo estos parámetros se determinó que el agente dispersante ideal para la determinación de cobre en muestras de agua es el H2O milli-Q, con una concentración para los GCE/MWCNTs de 4 [mg/mL] con 4 min. de t.a.
Copper is one of the most common metallic elements found within our waters and lands. It is one of the most important metals within the mining industry especially in our country. The waste water generated by industries (RILes), are characterized by contain large quantities and concentrations of contaminants, which have detrimental effect on environment and health of the living beings that inhabit surroundings. Analytical Chemistry, through the technique of cyclic voltammetry, allows us to determine the presence of copper in water samples, but the detection is directly related to a high concentration of metal in the sample. It's on the basis of this problem that the following undergraduate, it seeking improve a method chemical analysis which can detect and determine the existence of copper in water samples even if these is on low concentrations, through the modification of GCE with MWCNTs. The MWCNTs have unique properties, which at the moment of modification, increase and enhance the sensitivity of the GCE. Through experimental work, the ideal conditions of modification were determined, in addition to the dispersing agent indicated for the determination of the metal in water samples. The modification was carried out with four different solvents: Milli-Q H2O, DMF, CTAB and SDS, which were used to disperse the MWCNTs, which are completely insoluble. The determination of ideal dispersing agent and conditions of modification suitable, were determined from the study and evaluation of the parameters of repeatability, reproducibility and selectivity. Under these parameters was determinated that the ideal dispersing agent for the determination of copper in water samples is the Milli-Q H2O, with a concentration for GCE/MWCNTs 4 [mg/mL] with 4 min. a.t. (accumulation time).
Copper is one of the most common metallic elements found within our waters and lands. It is one of the most important metals within the mining industry especially in our country. The waste water generated by industries (RILes), are characterized by contain large quantities and concentrations of contaminants, which have detrimental effect on environment and health of the living beings that inhabit surroundings. Analytical Chemistry, through the technique of cyclic voltammetry, allows us to determine the presence of copper in water samples, but the detection is directly related to a high concentration of metal in the sample. It's on the basis of this problem that the following undergraduate, it seeking improve a method chemical analysis which can detect and determine the existence of copper in water samples even if these is on low concentrations, through the modification of GCE with MWCNTs. The MWCNTs have unique properties, which at the moment of modification, increase and enhance the sensitivity of the GCE. Through experimental work, the ideal conditions of modification were determined, in addition to the dispersing agent indicated for the determination of the metal in water samples. The modification was carried out with four different solvents: Milli-Q H2O, DMF, CTAB and SDS, which were used to disperse the MWCNTs, which are completely insoluble. The determination of ideal dispersing agent and conditions of modification suitable, were determined from the study and evaluation of the parameters of repeatability, reproducibility and selectivity. Under these parameters was determinated that the ideal dispersing agent for the determination of copper in water samples is the Milli-Q H2O, with a concentration for GCE/MWCNTs 4 [mg/mL] with 4 min. a.t. (accumulation time).
Notas
Tesis (Licenciado en Química)
Palabras clave
Electrodos de Carbón, Nanotubos de Carbono, Contenido de cobre en el agua