Determination of volatile halogenated hydrocarbons in drinking water by headspace-solid phase microextraction-gas chromatography-triple quadrupole mass spectrometry
Objective To establish a headspace solid-phase microextraction gas chromatography-triple quadrupole mass spectrometry method for the analysis of trichloromethane,carbon tetrachloride,dichloromethane,dichloromethane,and tribromomethane in drinking water.Explore the effects of fiber head extraction,extraction time,extraction temperature,ion strength,and desorption time on the detection results.Method Using DVB/CWR/PDMS 80 pm extraction head to take 10 mL of water sample into a headspace bottle and adding 3.0 g of NaCl,extract at 35 ℃ for 15 minutes,desorb at 250 ℃ for 5 minutes,and enter gas chromatography-mass spectrometry for analysis at a 50∶1 split ratio.Detection was performed in multiple reaction monitoring(MRM)mode,with external standard for quantification.Results The linear correlation coefficients(r)of this method were all ≥0.999,and the average recovery rates at three spiking levels were 80.1％-107.2％(n=6),with a relative standard deviation(RSD)of 0.4％-10％.Using this method to determine drinking water,trichloromethane,carbon tetrachloride,dichloromethane bromide,and dichlorodibromomethane were detected.Conclusion This method is simple,fast,accurate,reliable,and highly sensitive,and is suitable for short-term analysis of common volatile halogenated hydrocarbons in drinking water.
Headspace solid-phase microextractionMass spectrometryVolatile halogenated hydrocarbonsDrinking water
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