Otimização e validação de métodos analíticos para determinação de BTEX em água utilizando extração por headspace e microextração em fase sólida

Abstract

Recebido em 2/3/09; aceito em 18/8/09; publicado na web em 21/1/10 EVALUATION 0F ANALYTICAL METHODS FOR BTEX ANALYSIS IN WATER USING EXTRACTION BY HEADSPACE (HS) AND SOLID PHASE MICROEXTRACTION (SPME). Three analytical methods for the determination of BTEX 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 o C for 30 min for adsorption and to 250 o C for 4 min for desorption and were analyzed by GC-MS. 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.