Evaluation of analytical methods for btex analysis in water using extraction by headspace (HS) and solid phase microextraction (SPME)

Abstract

Three analytical methods for the determination of BTFX in water were optimized and validated. With the best method the analytes were extracted of 10 mL of sample with 2.50 g of NaCl in headspace vial of 20 mL by HS and SPME to 40 °C for 30 min for adsorption and to 250 °C for 4 min for desorption and were analyzed by GCMS. The recovery was between 97.9% and 104.3%, and the limit of detection was 2.4 ng L-1 for o-xylene. This method was using to analyze BTEX in water supply and surface water in Ouro Preto city. No sample had concentrations of BTEX above the legislation.