Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7610436 | Journal of Chromatography A | 2016 | 34 Pages |
Abstract
A high efficiency solid-phase microextraction (SPME) fiber coated with porous carbon nanotubes-silicon dioxide (CNTs-SiO2) nanohybrids was synthesized and applied for the determination of some organophosphorus pesticides (OPPs) in vegetables, fruits and water samples. Gas chromatography-corona discharge ion mobility spectrometry was used as the detection system. Glucose, as a biocompatible compound, was used for connecting CNT and SiO2 during a hydrothermal process. The electrospinning technique was also applied for the fiber preparation. The parameters affecting the efficiency of extraction, including stirring rate, salt effect, extraction temperature, extraction time, desorption temperature and desorption time, were investigated and optimized. The developed CNTs@SiO2 fiber presented better extraction efficiency than the commercial SPME fibers (PA, PDMS, and PDMS-DVB). The intra- and inter-day relative standard deviations were found to be lower than 6.2 and 9.0%, respectively. For water samples, the limits of detection were in the range of 0.005-0.020 μg Lâ1 and the limits of quantification were between 0.010 and 0.050 μg Lâ1. The results showed a good linearity in the range of 0.01-3.0 μg Lâ1 for the analytes. The spiking recoveries ranged from 79 (±9) to 99 (±8). The method was successfully applied for the determination of OPPs in real samples.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Mohammad Saraji, Mohammad Taghi Jafari, Mehdi Mossaddegh,