Identification method of 2-methylisoborneol and geosmin in water by purge and trap-gas chromatography-mass spectrometry
OBJECTIVE To establishe an analysis and identification method for 2-methylisoborneol(2-MIB)and geosmin(GSM)in water using purge and trap-gas chromatography-mass spectrometry.METHODS The samples were enriched and analyzed using a purge and trap system,followed by the separation on a DB-624(30 m× 0.25 mm,1.4 μm)chromatographic column.Quantification was performed using gas chromatography-mass spectrometry with the selected ion monitoring and internal standard calibration.RESULTS The calibration curves for 2-MIB and GSM showed an excellent linearity in the range of 1 to 100 ng/L with R2 values greater than 0.999.The detection limit and quantification limit for both 2-MIB and GSM were 0.33 ng/L and 1.0 ng/L,respectively.Spike recovery experiments were further carried on the source water and drinking water at three concentration levels.It showed that the average recoveries were from 82.0％to 111.0％for 2-MIB while 84.0％to 110％for GSM.Additionally,the test precision of 2-MIB and GSM ranged from 1.9％to 7.3％and 1.9％to 5.0％(n=6),respectively.The analysis of multiple samples including the local source water,treated water and distribution network water confirmed the existence of 2-MIB and GSM.CONCLUSION Compared to the national standard(GB/T 5750.8-2023),the proposed method enables fully automated sample introduction and analysis without the extra pre-treatment.It provides the advantages of simplicity,good repeatability and high accuracy.
2-methylisoborneolgeosmindrinking watersource waterpurge and trap-gas chromatography-mass spectrometry
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