DIRECT DETERMINATION OF STYRENE AND TETRACHLOROETHYLENE IN OLIVE OIL BY MEMBRANE INLET MASS-SPECTROMETRY

A rapid screening method of styrene and tetrachloroethylene in olive o il based on membrane inlet mass spectrometry has been developed. The p resence of these contaminants was identified and monitored on the basi s of the mass spectra measured. Detection limits of 100 and 5 ppb were measured for styrene and tetrachloroethylene, respectively. A linear dynamic range of at least 3 orders magnitude was achieved. Fast respon se times, in the order of 1 min, for the analytes were observed, allow ing large sample throughput.