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Title

AN ANILINE/METAL ORGANIC FRAMEWORK NANOCOMPOSITE AS A NEW EXTRACTING MEDIUM WITH HIGH ASPECT RATIO FOR SOLID PHASE MICROEXTRACTION OF CHLOROBENZENES

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Abstract

 A NEW UNBREAKABLE SOLID PHASE MICROEXTRACTION (SPME) FIBERS COATING BASED ON POLYANILINE/METAL ORGANIC FRAMEWORK (PANI/MOF) NANOCOMPOSITE WAS ELECTRODEPOSITED ON A STAINLESS STEEL WIRE AND USED FOR ISOLATION OF CHLOROBENZENES (CBS) IN AQUEOUS SAMPLES. THE ELECTROPOLYMERIZATION PROCESS WAS CARRIED OUT AT A CONSTANT DEPOSITION POTENTIAL AND APPLIED TO THE CORRESPONDING AQUEOUS ELECTROLYTE CONTAINING ANILINE AND MOF PARTICLES [1]. MOFS WITH THEIR LARGE AND SMALL CAGES AND 3D STRUCTURES ARE GOOD SUBSTRATES TO FORM MORE NON-SMOOTH AND POROUS STRUCTURES [2]. THE SCANNING ELECTRON MICROSCOPY (SEM) IMAGES VERIFIED THIS CLAIM. THREE DIFFERENT MOFS WERE INCORPORATED TO SYNTHESIZE THE NANOCOMPOSITES. SOME PRELIMINARY EXPERIMENTS SHOWED THAT THE PANI/MOFS NANOCOMPOSITES HAVE HIGHER PERFORMANCES THAN THE SOLE PANI. THE APPLICABILITY OF THE NEW FIBER COATING WAS EXAMINED BY HEADSPACE-SOLID PHASE MICROEXTRACTION (HS-SPME) OF SOME CBS FROM AQUEOUS SAMPLES. INFLUENCING PARAMETERS AFFECTING THE SYNTHESIZING OF NANOCOMPOSITE AND EXTRACTION PROCESSES WERE OPTIMIZED [3].EVENTUALLY, THE DEVELOPED METHOD WAS VALIDATED BY GAS CHROMATOGRAPHY-MASS SPECTROMETRY (GC–MS). AT THE OPTIMUM CONDITIONS, THE RELATIVE STANDARD DEVIATION (%RSD) VALUES FOR A DOUBLE DISTILLED WATER SPIKED WITH THE SELECTED CBS AT 20 NG L-1 WERE 5-8% (N=3) WHILE THE LIMIT OF DETECTION RESULTS WERE BETWEEN 0.1 AND 0.2 NG L-1. THE LINEAR DYNAMIC RANGE WAS IN THE CONCENTRATION RANGE FROM 0.5 TO 1000 NG L-1 (R2>0.9994). FINALLY THE DEVELOPED METHOD WAS APPLIED TO THE ANALYSIS OF SOME RIVERS AND TAP WATER SAMPLES AND THE RELATIVE RECOVERY VALUES WERE FOUND TO BE IN THE RANGE OF 92–98%.

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