Dispersive Solid-Phase Extraction (dSPE) Using Cu Functionalized Metal-Organic Frameworks (MOFs) For The Determination Of Metals In Gasoline Samples

M. A. AGUIRRE ; A. S. LORENZETTI; E. VIDAL; M. B. ÁLVAREZ; C. DOMINI; JOAQUÍN SILVESTRE-ALBERO; L. VIDAL; A. CANALS

Conferencia; 2 nd European Sample Preparation e-Conference and the 1 st Green and Sustainable Analytical Chemistry e-Conference; 2022

In this work, an analytical methodology based on the combination of dispersive solid-phase extraction with metal-organic frameworks (MOFs) was successfully developed. The MOFs were applied to the separation and preconcentration of Ag, Al, As, B, Ba, Ca, Cd, Cr, Fe, Hg, K, Mn, Mo, Ni, Pb, S, Se, Sn, Ti, V and Zn in gasoline samples before determination by Inductively Coupled Plasma Optical Emission Spectrometry (ICP OES). The main experimental factors affecting the extraction (i.e., extraction time, eluent solvent, centrifugation time, and amount of sample, sorbent, surfactant, and chelating agent) were optimized using a multivariate analysis. The experimental conditions for the efficient dispersive solid-phase extraction procedure were: 5 g of sample, 70 mg amount of sorbent, 0.7 % hexadecyltrimethylammonium bromide surfactant, 0.7 % sodium diethyldithiocarbamate trihydrate chelating agent, 8 min extraction time, 360 μL HNO 3 -HCl eluent solvent, and 5 min centrifugation time. Under optimized extraction conditions, the enrichment factor ranged between 4 and 405 and wide dynamic working ranges with good linearity R 2 >0.991 were obtained for all analytes. Gasoline samples were spiked at 100 μg kg -1 for all analytes, except sulfur (in this case at 1000 μg kg −1 ). Recovery values were within the range of 90-109%.