Optimisation and comparison of several microextraction/methylation methods for determining haloacetic acids in water using gas chromatography.

摘要: This article presents the different modes and configurations of liquid-phase microextraction (LPME) through comparison with headspace solid-phase (HS-SPME) for simultaneous extraction/methylation nine haloacetic acids (HAAs) found in water. is first analytical case reported solvent bar extraction–preconcentration–derivatisation assisted by an ion-pairing transfer HAAs. In this method, 5 μL organic extractant, decane, was confined within a hollow-fibre membrane that placed stirred aqueous sample containing derivatising reagents (dimethylsulphate tetrabutylammonium salt). With heating at 45 °C HS-SPME some solvents (extractant, excess reagent) are also volatilised compete esters on fibre (the damaged it can be reused only 50−60 times). addition, method provides inadequate sensitivity (limits detections between 0.3 µg/L) to quantify HAAs level usually drinking waters. Alternative LPME methods require (45 °C, 25 min) derivatise volatilise but, using (SBME), takes place room temperature without degradation trihalomethanes. Adequate precision (relative standard deviation approximately 8%), linearity (0.1–500 (10 times higher than alternative) indicate SBME candidate routine determination tap Finally, applied analysis swimming pool water results were compared those previous validated gas chromatography–mass spectrometry method.