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Taste and odor(T&O)problems in drinking water frequently occur because of many compounds present in the water,of which trans-1,10-dimethyl-trans-9-decalol(geosmin)and 2-methylisoborneol(MIB)are well-known.In this study,a fast and efective method was established for simultaneous determination of 10 T&O compounds,including geosmin,MIB,2,4,6-trichloroanisole(TCA),2-methylbenzofuran,2-isopropyl-3-methoxypyrazine(IPMP),2-isobutyl-3-methoxypyrazine(IBMP),cis-3-hexenyl acetate,trans,trans-2,4-heptadienal,trans,cis-2,6-nonadienal,and trans-2-decenal in water samples by headspace solid-phase microextraction(SPME)coupled with gas chromatography-mass spectrometry.An orthogonal array experimental design was used to optimize the efects of SPME fiber,extraction temperature,stirring rate,NaCl content,extraction time,and desorption time.The limits of detection ranged from 0.1 to 73 ng/L were lower than or close to the odor threshold concentrations(OTCs).All the 10 T&O compounds were detected in the 14 water samples including surface water,treatment process water and tap water,taken from a waterworks in Lianyungang City,China.MIB and geosmin were detected in most samples at low concentration.Six T&O compounds(IPMP,IBMP,trans,cis-2,6-nonadienal,2-methylbenzofuran,trans-2-decenal,and TCA)were efectively decreased in water treatment process(sedimentation and filtration)that is diferent from cis-3-hexenyl acetate,MIB and geosmin.It is noted that the TCA concentrations at 15.9–122.3 ng/L and the trans,cis-2,6-nonadienal concentrations at 79.9–190.1 ng/L were over 10 times higher than their OTCs in tap water.The variation of the analytes in the all water samples,especially distribution system indicated that distribution system cannot be ignored as a T&O compounds source.
Taste and odor (T & O) problems in drinking water frequently occur because of many compounds present in the water, of which trans-1,10-dimethyl-trans-9-decalol (geosmin) and 2-methylisoborneol (MIB) .In this study, a fast and efective method was established for simultaneous determination of 10 T & O compounds, including geosmin, MIB, 2,4,6-trichloroanisole (TCA), 2-methylbenzofuran, , 2-isobutyl-3-methoxypyrazine (IBMP), cis-3-hexenyl acetate, trans, trans-2,4-heptadienal, trans, cis-2,6-nonadienal, and trans-2-decenal in water samples by headspace solid-phase microextraction (SPME) coupled with gas chromatography-mass spectrometry. An orthogonal array experimental design was used to optimize the efects of SPME fiber, extraction temperature, stirring rate, NaCl content, extraction time, and desorption time.The limits of detection ranged from 0.1 to 73 ng / L were lower than or close to the odor threshold concentrations (OTCs). All the 10 T & O compounds were detected in the 14 water samples including surface water, treatment process water and tap water, taken from a waterworks in Lianyungang City, China. MIB and geosmin were detected in most samples at low concentration. XIX T & O compounds (IPMP, IBMP, trans, cis-2,6 -nonadienal, 2-methylbenzofuran, trans-2-decenal, and TCA) were efectively decreased in water treatment process (sedimentation and filtration) that is diferent from cis-3-hexenyl acetate, MIB and geosmin.It is noted that the TCA concentrations at 15.9-122.3 ng / L and the trans, cis-2,6-nonadienal concentrations at 79.9-190.1 ng / L were over 10 times higher than their OTCs in tap water. The variation of the analytes in the all water samples, especially distribution system indicated that distribution system can not be ignored as a T & O compounds source.