In this work, nanometer TiO2 modified by cetyl trimethyl ammonium bromide was used as adsorbent for solid-phase extraction of Parathion in environmental water samples. Adsorbed Parathion was then desorbed with different eluents and determined by GC/flame ionization detection. Parameters that might influence the extraction efficiency such as the eluent type and its volume, adsorbent amount, sample volume, sample pH and sample flow rate were optimized. Under the optimized extraction conditions with toluene as the eluent, the experimental results showed the excellent linearity of Parathion (R2 > 0.99) over the range of 0.01–0.8 μg/mL, and the relative standard deviation was 6.3% (n = 5). The detection limit of proposed method could reach 0.024 ng/mL based on the ratio of chromatographic signal to base line noise (S/N = 3). Recovery of 93% achieved with spiked water samples. The method was successfully applied to the analysis of surface water samples.
- gas chromatography
- nanometer TiO2
- First received 12 August 2015.
- Accepted in revised form 11 August 2016.
- © IWA Publishing 2016