Feasibility Study of Electric-Assisted Solid Phase Microextraction for Sampling Organic Pollutants in Water

A new electric-assisted solid phase microextraction (EA-SPME) technique using the lab-made carbonic fiber has been developed to sample organic compounds in water. The EA-SPME cell is composed by two electrodes: the working electrode is a SPME fiber and the counter-electrode is a piece of platinum (Pt) wire. Phenol, parachlorophenol, nitrobenzene and chloroform were examined under different electric voltages to explore the feasibility and applicability of the method. Results showed that electricity exert different impacts on adsorption processes. For instance, -1.0 voltage (V) loaded on the fiber could increase nitrobenzene adsorption with about 33%, and 1.5 V raised the amount to 122%, while electricity with -1.5 V decrease the adsorption of phenol to 91.1%. The influence was depended mostly on the voltages, but other influencing factors such as characteristics of the compounds, electrode distance could also affect the capacity of the adsorption.