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Determination of lead in water by combining precolumn adsorption and fluorimetric detection in a microfluidic device

T. Wu, L. Y. Zhao, D. Faye, J. P. Lefevre, J. Delaire and I. Leray Analytical Methods, 2012, 4, 4, 989-994

A microfluidic device equipped for in situ fluorescence detection and combined with an off-line microcolumn adsorption is proposed for the determination of lead in natural water. The precolumn adsorption is based on a microcapillary filled with aminopropyl silica. An efficient Pb2+ adsorption on aminopropyl silica was proved by Langmuir isotherm adsorption experiments. The maximum adsorption capacity was found to be 5.7 x 10(-4) mol g(-1). By using this solid phase extraction procedure (SPE), a 100-fold specific lead concentration was obtained. The concentrated solution was then run into a microfluidic device equipped for fluorescence detection and the complete procedure allows lead determination with a detection limit of 2 mu g L-1. Furthermore, it was found that these measurements are not disrupted by the addition of a large excess of other interfering cations.

Type :

Publication

Dates :

Paru le 9 mars 2012

Informations complémentaires :

doi 10.1039/c2ay05677a