GUOQiao-yuan,WANGChun-miao,SUNDao-lin,et al.Simultaneous Determination of 16 Thioether Odorous Substances in Drinking Water by HS-SPME-GC-MS/MS[J].China Water & Wastewater,2022,38(6):132-138.
Simultaneous Determination of 16 Thioether Odorous Substances in Drinking Water by HS-SPME-GC-MS/MS
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第6期
Page:
132-138
Column:
Date of publication:
2022-03-17
- Keywords:
- drinking water; odorous substances; thioether; HS-SPME; GC-MS/MS
- Abstract:
- Owing to fishy/boggy/rotten taste in drinking water caused by thioethers, a rapid detection method based on headspace-solid phase microextraction (HS-SPME) coupled with gas chromatography-triple quadrupole tandem mass spectrometry (GC-MS/MS) was developed for simultaneous determination of 16 thioether odorous substances in drinking water. The conditions such as SPME fiber type, salt concentration,extraction temperature, extraction and desorption times were optimized, and the optimal HS-SPME conditions were determined as follows: the water sample was added with 20% NaCl, extracted by DVB/PDMS/Carbon WR coated fiber at 45 ℃ for 30 min, and eventually desorbed at 250 ℃ for 180 s. The standard curves of 16 thioethers showed good linearity (R2 >0.99), and the detection limits ranged from 0.2 to 2.9 ng/L. The recovery rates of thioethers in ultrapure water and raw water samples were in the ranges of 80.4%-105.4% and 78.3%-108.2%, respectively, and the relative standard deviations were in the ranges of 0.7%-13.4% and 1.6%-14.1%, respectively, indicating that the method could meet the requirements for rapid detection of thioether odorous substances in drinking and source water. This method was applied to analyze raw water samples from three water plants, and dimethyl disulfide (4.2-45.3 ng/L), dimethyl trisulfide (1.9-6.1 ng/L) and diethyl disulfide (N.D.-1.5 ng/L) were detected in the samples. This phenomenon deserves our attention.
Last Update:
2022-03-17