Preparation and evaluation of a novel solid-phase microextraction fiber based on poly(3,4-ethylenedioxythiophene) for the analysis of OCPs in water

A novel polymer coating, based on electropolymerization of poly(3,4-ethylenedioxythiophene) on gold wire is introduced for headspace-solid phase microextraction (HS-SPME) of OCPs and applied for the analysis of these compounds in different water samples by coupling to GC-micro-ECD and GC-MS. The proposed fiber shows good porosity, temperature resistance (up to 300 degrees C), life time (more than 50 times) and satisfactory extraction efficiency for OCPs. In the analysis of OCPs, the effects of different parameters influencing the extraction efficiency such as extraction temperature, extraction time, ionic strength, desorption time, stirring rate and headspace volume were investigated and optimized. Under optimized conditions, the limits of detection varied from 0.16 to 0.84 ng L-1 and the correlation coefficients (R-2) of the calibration curves ranged from 0.9908 to 0.9968 showing an acceptable linearity within 1-100 ng L-1 . The single fiber repeatability and fiber-to-fiber reproducibility were <7.9 and <15.9%, respectively. The inter-day and intra-day precision of method were also evaluated to be <8.0 and <12.7%, respectively. The recoveries obtained in real sample analysis ranged from 63% to 126.7%.