METHOD FOR DETECTING AND QUANTIFYING HALOETHER CONTAMINATION IN AQUEOUS SAMPLES

摘要

A method for detecting and quantifying haloether contamination in aqueous samples. A flow state is artificially induced upon an aqueous sample and a solid phase microextraction (SPME) fiber, upon which an electric potential is applied, is exposed to the flowing aqueous sample in direct immersion mode. Halide ions liberated from electrophoretically dehalogenated haloether compounds contained in the aqueous sample are absorbed upon the SPME fiber, then later desorbed at a gas chromatograph, separated into individual halide ions and analyzed by mass spectrometry. Effects of various parameters such as absorption time, sample pH, salt content, applied voltage, SPME fiber type, flow rate and background matrix are also described.

主权项

1. A method for detecting and quantifying one or more haloether compounds in an aqueous sample, comprising:
inducing a flow state to the aqueous sample to form a flowing aqueous sample; immersing a fiber and an electrode into the flowing aqueous sample; electrophoretically dehalogenating the one or more haloether compounds present in the flowing aqueous sample to form a halide ion mixture, contacting the halide ion mixture with the fiber to absorb a halide ion from the halide ion mixture onto the fiber, wherein a negative voltage is applied to the fiber and a positive voltage is applied to the electrode during the electrophoretically dehalogenating and the contacting; then desorbing the halide ion from the fiber in a gas chromatograph; and detecting and determining concentration of the halide ion with a mass spectrometer.