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Title

ELECTROPOLYMERIZED POLYPYRROLE/MULTIWALLED CARBON NANOTUBES/TIO2 COMPOSITE ON STAINLESS STEEL WIRE FOR SOLID-PHASE MICROEXTRACTION OF BTEX COUPLED TO GC-FID

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Abstract

 A NOVEL SOLID-PHASE MICROEXTRACTION (SPME) FIBER BASED ON POLYPYRROLE-CARBON NANOTUBESTITANIUM OXIDE (PPY-CNT-TIO2) COMPOSITE IS COATED ONTO STAINLESS STEEL WIRE, WAS PREPARED VIA ELECTROCHEMICAL TECHNIQUES. THE FIBER WAS USED FOR THE HEADSPACE SOLID-PHASE MICROEXTRACTION (HS-SPME) OF BENZENE, TOLUENE, ETHYLBENZENE ANDO- XYLENE (BTEX), FOLLOWED BY GAS CHROMATOGRAPHY-FLAME IONIZATION DETECTOR (GC-FID). THE MORPHOLOGY OF THE FIBER SURFACES WAS INVESTIGATED BY SCANNING ELECTRON MICROSCOPY (SEM) AND ENERGY DISPERSIVE X-RAY SPECTROMETER (EDS). DUE TO THE UNIQUE PROPERTIES OF TIO2 [1], CNTS AND THE INHERENT ADVANTAGEOUS FEATURES AND ALSO THE PERFORMANCE OF THE CONDUCTIVE POLYMER COATING [2], THIS INNOVATIVE FIBER EXHIBITED POROUS SURFACE STRUCTURE, REPRODUCIBLE PREPARATION, HIGH SENSITIVITY, LONG LIFETIME, HIGH THERMAL STABILITY (OVER 400OC) AND STRONG ADHESION OF THE COATING TO THE STEEL WIRE. THE NEW PPY-CNTTIO2 FIBER IS FAIRLY SIMPLE TO PREPARE, ROBUST, WITH GOOD EXTRACTION EFFICIENCY. IMPORTANT PARAMETERS INFLUENCING THE EXTRACTION EFFICIENCY SUCH AS DESORPTION TEMPERATURE AND TIME, EXTRACTION TEMPERATURE, EXTRACTION TIME, STIRRING SPEED AND SALT EFFECT WERE INVESTIGATED AND OPTIMIZED [3]. UNDER THE OPTIMAL CONDITIONS, THE METHOD DETECTION LIMITS (S/N=3) WERE IN THE RANGE OF 0.01–0.04 NG ML–1 AND THE LIMITS OF QUANTIFICATION (S/N=10) BETWEEN 0.03–0.09 NG ML–1. THE RELATIVE STANDARD DEVIATIONS (RSDS) FOR ONE FIBER (REPEATABILITY) (N=5) WERE OBTAINED FROM 3.5 UP TO 5.6% AND BETWEEN FIBERS OR BATCH TO BATCH (N=3) (REPRODUCIBILITY) IN THE RANGE OF 5.9–8.1%. THE DEVELOPED METHOD WAS SUCCESSFULLY APPLIED TO REAL WATER SAMPLES WHILE THE RELATIVE RECOVERY PERCENTAGES OBTAINED FOR THE SPIKED WATER SAMPLES WERE FROM 93.7 TO 106.2%.

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