Mini-columns packed with natural zeolites of Cuba for determination of cobalt using the ligand APDC in a flow injection system coupled to a FAAS

  • Yaneira Petit de Peña Universidad de Los Andes - Venezuela
  • Wendy Rondón Instituto Venezolano de Investigaciones Científicas, IVIC -Venezuela
Palabras clave: cobalt, flow injection, preconcentration, zeolites, atomic absorption

Resumen

In this work, an analytical methodology for the determination of traces of cobalt in natural waters by formation of a neutral chelate with ammonium pyrrolidinedithiocarbamate(APDC) was developed. The neutral chelate formed was retained in a column packed with natural zeolites, and then eluted with MIBK to flame atomic absorption spectrometry (EAA) for its detection. The materials were characterized by Fourier Transform infrared spectroscopy and attenuated total reflectance (FTIR and ATR), scanning electron microscopy and energy dispersive X-ray microanalysis (MEB-EDX) and X-ray power diffraction (XRD), indicating that zeolites belong to the family of tectosilicatesClinoptilolite type. Then, use a FIA configuration, with a column preconcentration system coupled to the detection system. The detection limit (3 µ) and the relative standard deviation (% RSD), for 10 determinations of a solution of 30 µg L”“1 Co2+ and 2.3-4.5%, respectively. The sampling frequency of 27 h-1 and preconcentration factors from 130-160 were achieved, for a sample volume of 6 mL, indicating a high retention of the analyte on the zeolites material.

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Biografía del autor/a

Yaneira Petit de Peña, Universidad de Los Andes - Venezuela

Laboratorio de Espectroscopia Molecular, Facultad de Ciencias, Departamento de Química, Universidad de Los Andes, Apartado postal 5101-A. Mérida-Venezuela.

Wendy Rondón, Instituto Venezolano de Investigaciones Científicas, IVIC -Venezuela

Laboratorio de Química Analítica, Centro de Química, Instituto Venezolano de Investigaciones Científicas, IVIC, Apartado postal 21827. Caracas 1020-A, Venezuela.

Publicado
2016-07-18
Cómo citar
Petit de Peña, Y. y Rondón, W. (2016) «Mini-columns packed with natural zeolites of Cuba for determination of cobalt using the ligand APDC in a flow injection system coupled to a FAAS», Revista Técnica de la Facultad de Ingeniería. Universidad del Zulia, 37(3). Disponible en: https://produccioncientificaluz.org/index.php/tecnica/article/view/21203 (Accedido: 24diciembre2024).
Sección
Artículos de Investigación