Method for trihalomethane analysis in drinking water by solid-phase microextraction with gas chromatography and mass spectrometry detection

2013 ◽  
Vol 13 (2) ◽  
pp. 499-506 ◽  
Author(s):  
S. Valencia ◽  
J. Marín ◽  
G. Restrepo
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Drinking Water ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
High Sensitivity ◽  
Sample Volume ◽  
Mass Spectrometry Detection ◽  
Experimental Parameters ◽  
Magnetic Stirring

Headspace solid-phase microextraction coupled with gas chromatography and mass spectrometry detection (HS/SPME-GC/MSD) was optimized for trihalomethane (THM) determination in drinking water. A 75 μm fiber coated with carboxen/polydimethylsiloxane (75-CAR.PDMS) was used. Experimental parameters such as sample volume, time and temperature of extraction, time and temperature of desorption, magnetic stirring, and addition of sodium chloride (NaCl) were studied to determine their influence on THM extraction. Furthermore, analytical parameters such as linearity and detection limit were also evaluated. High sensitivity with detection limits in the μg/L range as well as a good linearity and reproducibility were achieved. Therefore, the HS/SPME-GC/MSD method with 75-CAR.PDMS is suitable for monitoring THMs in drinking water.

scholarly journals Gradual Optimization of Headspace Solid-Phase Microextraction Conditions of Volatiles in Pepper Chicken Soup Combined with Gas Chromatography-Mass Spectrometry and Principal Component Analysis

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Qiuyue Geng ◽  
Ping Zhan ◽  
Honglei Tian ◽  
Peng Wang ◽  
Haitao Chen
Keyword(s):  
Mass Spectrometry ◽  
Principal Component Analysis ◽  
Gas Chromatography ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Principal Component ◽  
Sample Volume ◽  
Extraction Time ◽  
Gas Chromatography Mass Spectrometry ◽  
Extraction Temperature

A single-factor gradual optimization method was developed in this experiment in order to improve the headspace solid-phase microextraction (HS-SPME) effect of volatile compounds in pepper chicken soup. The different extraction conditions included fibers with different coating materials, sample volume, extraction temperature, and extraction time. The total peak areas and the numbers of valid peaks were compared and analyzed as the indicators of condition optimization. Gas chromatography-mass spectrometry (GC-MS) results showed that the four factors all have significant impact on the extraction effect of volatiles in pepper chicken soup. Using the principal component analysis (PCA), the optimal conditions of HS-SPME were inferred below: an extraction fiber of 50/30μm DVB/CAR/PDMS, a sample volume of 7 g, an extraction temperature of 65°C, and an extraction time of 30 min. Compared to the original extraction conditions, the optimized conditions were especially advantageous for the comprehensive analysis of volatiles, which could be potentially used in further study of soup.

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