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Title

ELECTROSPUN MODIFIED POLYAMIDE NANOFIBERS AS A NOVEL FIBER COATING FOR RAPID DETERMINATION OF CHLOROPHENOLS

Pages

 Start Page | End Page

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Abstract

 IN SOLID PHASE MICROEXTRACTION, SAMPLING, EXTRACTION AND PRECONCENTRATION ARE PERFORMED IN A SINGLE STEP. THE DEVELOPMENTS OF NEW FIBER COATINGS ARE MOSTLY FOCUSED ON IMPROVING THE THERMAL, MECHANICAL AND CHEMICAL STABILITY, IMPARTING DIVERSE FUNCTIONALITIES AND POLARITIES, AND ENHANCING THE FIBER CAPACITY. ELECTROSPINNING IS A SIMPLE AND CONVENIENT METHOD FOR PRODUCING NANOFIBERS WITH ADJUSTABLE DIAMETERS, POLARITIES AND POROSITIES. THEY HAVE MALLEABILITY TO CONFORM TO A WIDE VARIETY OF SHAPES AND SIZES [1]. TO FOLLOW OUR RESEARCH INTERESTS [2], A MIXTURE OF PA AND POLYETHYLENE GLYCOL (PEG) WAS SYNTHESIZED VIA ELECTROSPINING AND THE RESULTANT NANFIBERS COATING WAS EMPLOYED FOR HEADSPACE SOLID PHASE MICROEXTRACTION (HS-SPME) AND RAPID DETERMINATION OF CHLOROPHENOLS. THE MAJOR POLYMER SOLUTION CONTAINED PA ALONG WITH PEG, ACTING AS A SIDE LOW MOLECULAR WEIGHT POLYMER. AFTER SYNTHESIZING THE PA􀃭PEG FIBER COATING, PEG WAS SUBSEQUENTLY REMOVED BY WATER (MODIFIED PA), CONFIRMED BY FOURIER TRANSFORM INFRA-RED SPECTROMETRY. THE SCANNING ELECTRON MICROSCOPY IMAGES SHOWED AN AVERAGE DIAMETER OF 640 AND 148 NM FOR PA AND PA-PEG COATINGS, RESPECTIVELY WHILE THE LATTER COATING STRUCTURE WAS MORE HOMOGENEOUS AND POROUS.THE EXTRACTION EFFICIENCIES OF PA, PA-PEG AND MODIFIED PA FIBER COATINGS WERE ASSAYED BY ISOLATION OF A NUMBER OF CHLOROPHENOLS FROM REAL WATER SAMPLES. EVENTUALLY THE EXTRACTANTS WERE ANALYZED BY GAS CHROMATOGRAPHY-FLAME IONIZATION DETECTOR AND GAS CHROMATOGRAPHYMASS SPECTROMETRY. THE EFFECT OF ADDED AMOUNTS OF PEG TO THE MAIN PA CONSTITUENT AND THE FLOW RATE OF ELECTROSPINNIG SOLUTION WERE ALSO STUDIED. VARIOUS INFLUENTIAL PARAMETERS ASSOCIATED WITH THE EXTRACTION EFFICIENCY SUCH AS THE SALT CONTENT, DESORPTION CONDITION, EXTRACTION TEMPERATURE AND TIME WERE OPTIMIZED. THE DETECTION LIMITS OF THE METHOD WERE IN THE RANGE OF 0.8-25 NG L-1, WHILE THE RELATIVE STANDARD DEVIATIONS (RSD %) AT TWO CONCENTRATION LEVELS OF 200 NG L-1 AND 80 NG L-1 WERE BETWEEN 2.1 AND 12.2%. THE CALIBRATION CURVES FOR THE SELECTED PHENOLS WERE LINEAR IN THE RANGE OF 8-1500 NG L-1. THE ANALYSIS OF REAL WATER SAMPLES LED TO RELATIVE RECOVERIES VALUES BETWEEN 85 AND 98% FOR ALL THE SELECTED PHENOLS.

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