prior to the polymerization procedure, the stainless steel wire surface was first roughened by a smooth sand paper and then washed in acetone while sonicating . it was subsequently cleaned with distilled water. then nanocomposite was directly electrodeposited on the wire surface as a film in an aqueous well dispersed suspension of modified CNTs(0.1 wt)containing 0.05 mol L oPD and 0.1 mol ot monomers by applying a constant potential of 1.5 V for 1000s at room temperature. before using in HS-SPME experiment, the fiber was preheated at 100 c for 1 h and then was inserted into a GC injector port at 300 c for 2 h while the helium gas flowing.