vortex assisted dispersive solid phase microextraction of cd(ii) using zeolite imidazolate framework (zif-8) from environmental samples before faas determination

Cadmium as a highly toxic metal is released into the environment through paper production, metal processing, phosphate fertilizers, insecticides, and treatment of wastewater [1]. cadmium also inhibits the body activities and is very toxic for kidney and other organisms [2]. metal-organic frameworks (mofs) have been intensely studied for the past few decades as an enormous family of highly tunable porous materials with promisingly applicable functionalities in adsorption, separation, catalysis, sensing, electrochemistry, and a great number of emerging purposes. zeolitic imidazolate frameworks (zifs) are a subclass of metal-organic frameworks (mofs) with isomorphic topologies of zeolites and coordinative composition of mofs. they are fabricated via the self-assembly of transition metal ions and imidazolate linkers through tetrahedral coordination. owning an approximate metal-imidazole-metal angle of 145° and analogous structures to aluminosilicate zeolites [3]. therefore, zifs combine the advantages of both mofs and natural zeolite. due to their unique properties consisting of ultrahigh porosity, hydrophobicity, satisfactory thermo-chemical stability, and easy synthesis, zif-8 mof nanoparticles are great candidate materials for adsorption applications [4]. in the current study, zeolitic imidazolate framework (zif)-8, was synthesized, fully characterized, and applied for the adsorption of cd(ii) in soli, vegetable juice, and water samples using vortex assisted dispersive solid phase microextraction method before determination by flame atomic absorption spectroscopy. the optimum conditions for this method were: ph of solution: 7, vortex mixing time for sorption:30 seconds, amount of adsorbent:10 mg, concentration of analyte 0.5 ppm, type and concentration of eluent: hcl and 0.03 moll-1, volume of eluent:3ml. under the optimized conditions the limit of detection and relative standard deviation for the detection of cadmium ions were found to be 0.27 ppb and 0.81%, respectively.