Determination of Six Typical Taste and Odor Compounds Using Large Volume Concentration,Solid Phase Micro-extraction and Gas Chromatography-Mass Spectrometry
The taste and odor(TO) compounds including 2-methylisoborneol(2-MIB),geosmin(GSM),2,4,6-trichloroanisole(2,4,6-TCA),β-Cyclocitral,β-Ionone and Dimethyl trisulfide(DMTS) ubiquitously exist in water environments.To simultaneously detect these compounds,large volume concentration and SPME-GC/MS method using a 100-mL customized extraction bottle was developed.The extraction conditions were optimized as follows: extraction time of 30 min,NaCl concentration of 0.3 g/mL,extraction temperature of 65 ℃,and desorption time of 2 min.The extraction was not significantly influenced by pH values(4-9).This method exhibited high sensitivity with the detection limits below 1 ng/L,good precision with recoveries ratio ranged between 86.0% and 114.2%,and good linear response for the concentrations from 1.0 to 200 ng/L.It was successfully applied to analyze various environment water samples from rivers,lakes,reservoirs as well as the effluent of water works and distribution systems.The results indicated that the concentrations of DMTS,2-MIB and β-Cyclocitral were relatively high in eutrophication water,while TCA was primary detected in distribution system with higher concentration.