Electrochemical solid-phase microextraction of anions and cations using polypyrrole coatings and an integrated three-electrode device

摘要: A method for the extraction, transfer and desorption of anions cations under controlled potential conditions employing a new integrated three-electrode device is described. The device, containing working, reference counter electrodes, was prepared from tubes that could be moved vertically with respect to each other. In this way, small amount solvent, held by capillary force, remained between electrodes when lifted out solution after an extraction. This design allowed control maintained at all times. With it possible perform into vials as little 200 μl solution. required ion exchange capacity obtained electrodeposition polypyrrole coating on surface glassy carbon working electrode. Solid-phase microextractions several or were performed simultaneously potentiostatic doping the polypyrrole different such perchlorate p-toluenesulfonate. efficiency extractions, which altered varying electrode, increased 150 200% compared extractions using normal solid-phase microextraction open circuit conditions. constant +1.0 V –0.5 silver pseudo found well-suited extraction samples ppm concentrations (chloride, nitrite, bromide, nitrate, sulfate phosphate) (cadmium, cobalt zinc), respectively.