Evaluation of Metal-Organic Framework as Low-Cost Adsorbent Material in the Determination of Pesticide Residues in Sours
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Evaluation of Metal-Organic Framework as Low-Cost Adsorbent Material in the Determination of Pesticide Residues in Soursop Exotic Fruit (Annona muricata) by Liquid Chromatography Roberta dos Anjos de Jesus & Luís Fabrício Santana Santos & Sandro Navickiene & Maria Eliane de Mesquita
Received: 28 April 2014 / Accepted: 4 June 2014 # Springer Science+Business Media New York 2014
Abstract The metal-organic framework ∞[(Nd0.9Eu0.1)2(DPA)3(H2O)3] was tested for extraction of t h i a m e t h o x a m , t h i a c l o p r i d , th i o p h a n a t e - m e t h y l , teflubenzuron, and bifenthrin from soursop exotic fruit (Annona muricata), with analysis using liquid chromatography with UV diode array detector (DAD). Experiments were carried out at one fortification level (0.5 mg kg−1, n=5) and resulted in recoveries in the range 78 to 88 %, with relative standard deviation (RSD) values between 2.2 and 8.0 % for ∞[(Nd0.9Eu0.1)2(DPA)3(H2O)3] sorbent. Detection and quantification limits were in the ranges 0.03–0.05 and 0.1– 0.2 mg kg−1, respectively, for the different pesticides studied. The method developed was linear over the range tested (0.08–100 mg kg−1), with correlation coefficients ranging from 0.9995 to 0.9999. Comparison between ∞[(Nd0.9Eu0.1)2(DPA)3(H2O)3] and conventional sorbent (Florisil) showed similar performance of ∞[(Nd0.9Eu0.1)2(DPA)3(H2O)3] polymeric sorbent for all pesticides tested.
Keywords Coordination polymer . HPLC/UV-DAD . Matrix solid-phase dispersion . Metal-organic framework . Pesticides . Soursop
R. dos Anjos de Jesus : L. F. S. Santos : S. Navickiene (*) : M. E. de Mesquita Department of Chemistry, Federal University of Sergipe, São Cristóvão, SE 49100-000, Brazil e-mail: [email protected] M. E. de Mesquita e-mail: [email protected]
Introduction Metal-organic frameworks (MOFs) are a recently identified class of porous polymeric material, consisting of metal ions linked together by organic bridging ligands (James 2003; Burrows 2012). Most of the reports concerning applications of MOFs have focused on catalysis (Mueller et al. 2006; Shultz et al. 2009) or gas adsorption (Nijem et al. 2010), while the exploration of these materials as pre-concentrators for solid-phase extraction (SPE) has been sparsely reported (Zhou et al. 2006). The interest of our group is in the use of MOFs as stationary phases, since they can be tailored to selective sorption profiles based on the control of structural dimensionalities, shape and pore size, and hydrophobic and hydrophilic properties. It is important to stress that the materials conventionally used as pre-concentrators have limited sorption capacity or have low selectivity for specific analytes. Moreover, they can present incomplete or slow desorption of analytes. Therefore, MOFs can be regarded as interesting alternative sorbent materials for use in the detection of organic pollutants. A demand for soursop for pulp is strong at national and international levels and has motivated the expansion of plantations mainly useful as a processed commodity
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