TIAN Liang-liang,QU Xin,FANG Chang-ling,et al.Determination of Earthy-musty Odorants in Tap Water by Gas Chromatography-Mass Spectrometry with Dispersion Solid-phase[J].Journal of Instrumental Analysis,2023,42(07):882-887.
TIAN Liang-liang,QU Xin,FANG Chang-ling,et al.Determination of Earthy-musty Odorants in Tap Water by Gas Chromatography-Mass Spectrometry with Dispersion Solid-phase[J].Journal of Instrumental Analysis,2023,42(07):882-887. DOI: 10.19969/j.fxcsxb.23032301.
Determination of Earthy-musty Odorants in Tap Water by Gas Chromatography-Mass Spectrometry with Dispersion Solid-phase
A gas chromatography-mass spectrometry(GC-MS) with dispersive solid-phase extraction was developed for the analysis of earthy-musty odorants,including geosmin(GSM) and 2-methylisoborneol(2-MIB) in tap water.,n,-hexane liquid-liquid extraction(LLE) combined with silica dispersion solid-phase(DSP) was used to isolate the analytes in tap water.The pretreatment conditions including the volume of extractant,time of DSP and eluent ratio were optimized.The optimal experimental conditions were as follows:the samples were extracted with 15 mL ,n,-hexane,then the targets in extract solution were absorbed with 0.5 g silica for 7 min,and finally,1 mL ,n,-hexane/ethyl acetate(1∶1,by volume) was used to elute the compounds.The chromatographic conditions for detection of GSM and 2-MIB were optimized,then the supernatant was determined by GC-MS in selected ion monitoring(SIM) mode,and quantified by the internal standard method.The results showed that there were good linearities for GSM and 2-MIB in the range of 0.5-500 ng/mL,with correlation coefficients(,r,2,) greater than 0.999.The limits of detection(LODs) for GSM and 2-MIB were 0.8 ng/L and 0.4 ng/L,respectively,while the limits of quantitation(LOQs) for GSM and 2-MIB were 2.5 ng/L and 1.5 ng/L,respectively.The average recoveries for GSM and 2-MIB in tap water,at five spiked levels of 4,8,20,80,400 ng/L ranged from 72.7% to 114%,with relative standard deviations(RSDs) of 1.1%-7.8%.The method is simple in operation and accurate in quantification,and it is suitable for the determination of GSM and 2-MIB in tap water.
关键词
土臭素(GSM)2-甲基异冰片(2-MIB)正己烷硅胶气相色谱-质谱法(GC-MS)自来水
Keywords
geosmin(GSM)2-methylisoborneol(2-MIB)hexanesilicagas chromatography-mass spectrometry(GC-MS)tap water
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Related Institution
Guangdong Provincial Key Laboratory of Chemical Measurement and Emergency Test Technology,Institute of Analysis,Guangdong Academy of Sciences(China National Analytical Center,)
School of Environment and Energy,South China University of Technology