Determination of 9 Nitrogen-Containing DBPs in Drinking Water by Purge and Trap-Gas Chromatography-Triple Quadrupole Mass Spectrometry
To establish a method for the determination of six haloacetonitriles and three halogenated nitromethane disinfection by-products(DBPs)in drinking water by purge and trap triple four stage GC/MS,and to understand the concentration level of target DBPs in drinking water in this city.Optimize the purge and capture conditions,establish a detection method using gas chromatography-mass spectrometry,and detect daily drinking water and raw water samples.Select a 10#trap(2,6-diphenyl phenyl ether/silica gel/carbon molecular sieve)and a DB-VRX chromatographic column.Compare the pre-treatment sensitivity of a 25 mL purge tube with a 5 mL purge tube.Determine a purge time of 11 minutes,a trap temperature of 40℃,a trap thermal desorption temperature of 190℃,and a transfer line temperature of 115℃,The baking time is 10 minutes,and the blowing flow rate is 40 mL/min.Detected in SRM mode.Quantitative analysis using external standard method.The results showed that the linear range of each substance was good,with r>0.996.The detection limit of the method(LODs)was 0.051～0.14 μg/L,and the quantitative limit was 0.25～0.56 μg/L.The recovery rates of the two different concentrations were 70.2%～117.0%,and the relative standard deviation was 2.45%～10.50%.This method is efficient,sensitive and simple to operate,and can effectively detect DBPs such as halogen acetonitrile and halonitromethane.The factory water and pipe network water are tested.In different disinfection processes of sodium hypochlorite,liquid chlorine and chlorine dioxide,the mass concentration of halogen acetonitrile is different,ND～3.20 μg/L,and haloated nitromethane is not detected.
halogenic nitromethanehalo acetonitrileschromatography-triple quadrupole mass spectrometrydrinking water nitrogen-containing disinfection by-products(DBPs)
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