Testing of carbon nanotubes as a sorbent for fully automated SPE procedure using metsulfuron methyl as a target analyte

ZELENÁ, LUCIE; ACEBAL, CAROLINA C.; LLAMAS, NATALIA E.; GRÜNHUT, MARCOS; LISTA, ADRIANA G.; SKLENÁROVÁ, HANA; FERNANDEZ BAND, BEATRIZ S.; SOLICH, PETR

Praga

Conferencia; Flow Analysis XIII; 2015

The singular properties of carbon nanotubes (CNTs) and the advantages of flow methodologies applied to solid phase extraction (SPE) have led to the development of new analytical approaches [1]. The aim of this work was to develop a simple fully-automated flow system for preconcentration of metsulfuron methyl (MSM), used as target analyte, in a minicolumn packed with CNTs (multiwall, 13?16 nm, purity >95%, Bayer). The continuous system was divided into two modules, preconcentration module and detection module.The preconcentration module was based on a continuos flow system and consisted of four channels: eluent (ACN), washing solution (water), standard/sample solution (MSM) and channel with air for drying the column before elution step. The detection module included a lab-made photodegradation reactor coupled to a fluorescence detector. As MSM is not a native fluorescent compound, fluorescence signals can be obtained upon UV irradiation [2].The minicolumn was packed with CNTs and oxidized CNTs [3] and obtained results were compared. Effect of sample and eluent volume and flow rate of PP were also tested. The effect of sample pH (optimal range of 2.00 - 2.50) on the adsorption has shown to be critical. Obtained results will be discussed.[1] C. Acebal, B. Simonet, M. Valcárcel, TrAC 43 (2013) 109.[2] C. Acebal, M. Grünhut, I. ?rámková, P. Chocholou?, A. Lista, H. Sklenářová, P. Solich, B. Fernández Band, Talanta 129 (2014) 233.[3] F. Avilés, J.V. Cauich-Rodríguez, L. Moo-Tah, A. May-Pat, R. Vargas-Coronado, Carbon 47 (2009) 2970.The authors acknowledge financial support of bilateral cooperation project, MINCyT-MEYS No. ARC/13/09 (7AMB14AR029). B. Fernandez Band, M. Grünhut and C. Acebal also would like to express their gratitude to CONICET.