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Artículo

Synthesis and characterisation of a silicon oxide film solid-phase extraction system for lead traces determination: an all the way green analytical method

Copello, Guillermo JavierIcon ; Martínez Vivot, RocíoIcon ; Varela, María Florencia; Diaz, Luis EduardoIcon
Fecha de publicación: 08/2011
Editorial: Taylor & Francis
Revista: International Journal of Environmental Analytical Chemistry
ISSN: 0306-7319
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
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Resumen

In this work, an all the way green analytical procedure based on a silicon oxide film-solid phase extraction system is proposed for lead traces determination. From the synthesis of a solid phase extraction (SPE) system and throughout the metal preconcentration and determination only aqueous media were employed. Characterisation of the film was carried out by Scanning Electron Microscopy and Attenuated Total Reflectance-Fourier Transform Infrared Spectroscopy. Preconcentration conditions, prior to Pb(II) Electrothermal Atomic Absorption Spectrometry (ETAAS) determination, such as adsorption and desorption time, pH and temperature, were optimised. Langmuir, Freundlich and Dubinin-Radushkevich isotherm models were analysed along with the evaluation of adsorption energy and standard free energy (ΔG 0). The greatest adsorption was obtained with incubation at pH 7 and 37°C. By using a small volume of 0.5 mol L−1 HNO3 (0.5 mL) lead was desorbed from the silicon oxide film after 2 h incubation, generating low amount of waste. The films showed better adjustment for the Langmuir model (R2  = 0.989). The detection limit (3.29σ) for Pb(II) was 0.228 µg L−1. The developed procedure is 10-fold more sensitive in comparison to direct ETAAS determination. Recovery values from soft tap-water and soft well-water were above 95%. When hard water was analysed, Pb(II) adsorption was found to be interfered by Mg2+ and Ca2+. After five preconcentration cycles relative recovery was found not to decay below 90%, indicating that the silicon oxide film could be used for multiple lead determinations.
Palabras clave: Green Chemistry , Silicon Oxide , Lead Traces , Solid Phase Extraction , Atomic Absorption
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
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URI: http://hdl.handle.net/11336/18205
URL: http://www.tandfonline.com/doi/abs/10.1080/03067311003628612
DOI: http://dx.doi.org/10.1080/03067311003628612
Colecciones
Articulos(IQUIFIB)
Articulos de INST.DE QUIMICA Y FISICO-QUIMICA BIOLOGICAS "PROF. ALEJANDRO C. PALADINI"
Articulos(IQUIMEFA)
Articulos de INST.QUIMICA Y METABOLISMO DEL FARMACO (I)
Citación
Copello, Guillermo Javier; Martínez Vivot, Rocío; Varela, María Florencia; Diaz, Luis Eduardo; Synthesis and characterisation of a silicon oxide film solid-phase extraction system for lead traces determination: an all the way green analytical method; Taylor & Francis; International Journal of Environmental Analytical Chemistry; 91; 9; 8-2011; 828-843
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