顶空-气相色谱质谱法测定三卤甲烷的方法建立

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Establishment of a Method for the Determination of Trihalomethanes by Headspace-Gas Chromatography Mass Spectrometry

ANXiaowei，LYUZewei （Tianjin Hongqiao District Disease Control and Prevention Center， Tianjin 300l31， China）

Abstract： Objective： To establish a method for the determination of trihalomethanes in drinking water by headspace injection-gas chromatography mass spectrometry，to understand the status of drinking water disinfection by-products in Tianjin，and to provide technical support for the implementation of national drinking water projects. Method： 0.3g of ascorbic acid was added to the brown grinding glass botte during sample collection， and capped and sealed after sampling.A 10.0mL water sample was accuratelypipetted into a 20mL headspace vial， automatically filed with headspace，and quantified using a TG-5SILMS capillary column in selective ion monitoring mode. Result： The linear relationship between the target substances was good at 0～50.0μg⋅L-1 ，the detection limit of the method was 0.0075～0.0330μg⋅L-1 ， the limits of quantification was 0.025 0～0.110 1μg⋅L-1 ， the average recovery rate was 93.5%～106.0% ，and the relative standard deviation of precision experiment was 2.14%～2.62% Conclusion： The detection processofthis method issimple，thesensitivityis high，therecoveryrate is high，and the precisionis good， which can provide a new idea for the determination of trihalomethanes.

Keywords： headspace capillary column gas chromatography mass spectrometry; trihalomethanes; drinking water

目前，氯化消毒在国内饮用水中的应用较为广泛，氯化消毒具有杀菌效果好、杀菌快、成本低等优点，但消毒剂可与有机前体物质反应产生一系列消毒副产物[1]，如三卤甲烷（Trihalomethanes，THMs）。（剩余2882字）