In this study, polyamide containing triazine ring was coated on a nichrome fiber and used for direct immersion solid-phase microextraction of ethion from standard sample, wastewater, well water, river water, and cucumber. Negative corona discharge ion mobility spectrometry was used for the determination of the analyte. Different parameters affecting the extraction efficiency, including ionic strength, extraction time and temperature, sample pH, stirring rate, and desorption temperature were investigated and optimized. The optimized conditions were as follows: 20 min extraction time at the temperature of 65 °C, stirring rate of 900 rpm, sample pH=4.0 and desorption temperature of 220 °C. Under the optimized conditions, linear dynamic ranges between 5.0-100 ?g L -1 and 75.0-750 ?g kg -1 were obtained for water samples and cucumber, respectively. The detection limits were lower than 1.2 ?g L -1 for water samples and 20 ?g kg -1 for cucumber, respectively. The relative standard deviations were lower than 10 % for all samples. Spiking recoveries were in the range of 86% to 112%.
