Determination of Iodinated Trihalomethanes in Water by Using Automated Headspace Solid-Phase Microextraction/Gas Chromatography-Mass Spectrometry
Iodinated trihalomethanes(I-THMs)is a new unregulated disinfection by-product(DBPs),which has the characteristics of low concentration and high toxicity compared with other iodinated trihalomethanes.This paper introduced the automated headspace solid phase microextraction-gas chromatography-mass spectrometry method for the detection of six iodinated trihalomethanes in drinking water and raw water.The extraction conditions were as follows:50/30 DVB/CAR/PDMS as the microextraction fiber,extraction temperature 50 ℃,extraction time 25 min,agitation speed 400 r/min,desorption temperature 210 ℃,desorption time 1 min.The detection limits of the targets were from 4.2 to 11.0 ng/L,the calibration curve range was from 10 to 400 ng/L,and the linear correlation coefficients of each target were greater than 0.998.Three spiked mass concentrations of 50,100 ng/L and 200 ng/L were selected,and the method was verified with pure water,factory water and raw water as background.The relative standard deviation(RSD)was from 0.9％to 7.3％,and the spiked recovery rate was 71％～118％.It was verified that the solid-phase microextraction-gas chromatography-mass spectrometry method could be accurately and precisely applied to the detection of trace I-THMs in drinking water and raw water.The method was used to detect drinking water from the WTPs in Shanghai.Six iodinated trihalomethanes were detected in samples except iodoform,and dichloroiodomethane and bromochloroiodomethane were detected at higher concentrations.
iodinated trihalomethanes(I-THMs)solid phase microextractiondrinking waterdisinfection by product(DBP)method verification
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