title: Simultaneous determination of eight common odors in natural water body using automatic purge and trap coupled to gas chromatography with mass spectrometry.
abstract: Production and fate of taste and odor (T&O) compounds in natural waters are a pressing environmental issue. Simultaneous determination of these complex compounds (covering a wide range of boiling points) has been difficult. A simple and sensitive method for the determination of eight malodors products of cyanobacterial blooms was developed using automatic purge and trap (P&T) coupled with gas chromatography-mass spectrometry (GC-MS). This extraction and concentration technique is solvent-free. Dimethylsulfide (DMS), dimethyltrisulfide (DMTS), 2-isopropyl-3-methoxypyrazine (IPMP), 2-isobutyl-3-methoxypyrazine (IBMP), 2-methylisoborneol (MIB), β-cyclocitral, geosmin (GSM) and β-ionone were separated within 15.3 min. P&T uses trap #07 and high-purity nitrogen purge gas. The calibration curves of the eight odors show good linearity in the range of 1-500 ng/L with a correlation coefficient above 0.999 (levels=8) and with residuals ranging from approximately 83% to 124%. The limits of detection (LOD) (S/N=3) are all below 1.5 ng/L that of GSM is even lower at 0.08 ng/L. The relative standard deviations (RSD) are between 3.38% and 8.59% (n=5) and recoveries of the analytes from water samples of a eutrophic lake are between 80.54% and 114.91%. This method could be widely employed for monitoring these eight odors in natural waters.
authors.affiliation: Donghu Experimental Station of Lake Ecosystems, State Key Laboratory of Freshwater Ecology and Biotechnology of China, Institute of Hydrobiology, Chinese Academy of Sciences, Donghu South Road 7, Wuhan, Hubei 430072, China.
authors.forename: Xuwei
authors.initials: X
authors.lastname: Deng
authors.forename: Gaodao
authors.initials: G
authors.lastname: Liang
authors.forename: Jun
authors.initials: J
authors.lastname: Chen
authors.forename: Min
authors.initials: M
authors.lastname: Qi
authors.forename: Ping
authors.initials: P
authors.lastname: Xie
mesh_terms: D000327:Adsorption; D000447:Aldehydes / Q000032:analysis / Q000302:isolation & purification; D001892:Camphanes / Q000032:analysis / Q000302:isolation & purification; D004224:Diterpenes / Q000032:analysis / Q000302:isolation & purification; D005068:Eutrophication; D005618:Fresh Water / Q000032:analysis*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D009284:Naphthols / Q000032:analysis / Q000302:isolation & purification; D045792:Norisoprenoids / Q000032:analysis / Q000302:isolation & purification; D009812:Odorants / Q000032:analysis*; D011719:Pyrazines / Q000032:analysis / Q000302:isolation & purification; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013440:Sulfides / Q000032:analysis / Q000302:isolation & purification; D013696:Temperature
chemical_list: D000447:Aldehydes; D001892:Camphanes; D004224:Diterpenes; D009284:Naphthols; D045792:Norisoprenoids; D011719:Pyrazines; D013440:Sulfides; C005536:2-methylisoborneol; C516118:beta-cyclocitral; C008157:beta-ionone; C001278:geosmin