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Trace analysis of off-flavor/odor compounds in water using liquid-liquid microextraction coupled with gas chromatography—positive chemical ionization-tandem mass spectrometry |
Jian LU1,Paul S. WILLS2,P. CHRIS WILSON1,*() |
1. Indian River Research and Education Center, University of Florida/IFAS, 2199 South Rock Road, Fort Pierce, FL 34945-3138, USA 2. Harbor Branch Oceanographic Institute at Florida Atlantic University, 5600 U.S. 1 North, Fort Pierce, FL 34946, USA |
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Abstract A rapid, inexpensive and laboratory friendly method was developed for analysis of off-flavor/odor compounds in fresh and salt water using gas chromatography with chemical ionization-tandem mass spectrometry. Off-flavor/odor compounds included geosmin, 2-methylisoborneol (MIB), 2-isobutyl-3-methyoxypyrazine (IBMP), and 2-isopropyl-3-methoxypyrazine (IPMP). Using this method, a single sample can be extracted within minutes using only 1 mL of organic solvent. The ion transitions for IPMP, IBMP, MIB, and geosmin were 153>121, 167>125, 152>95, and 165>109, respectively. The linearity of this method for analyzing MIB ranged from 4 to 200 ng·L-1, and from 0.8 to 200 ng·L-1 for the other analytes. Method recoveries ranged from 97% to 111% and percent relative standard deviations ranged from 3% to 9%, indicating that the method is accurate, precise, and reliable.
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Keywords
off-flavor/odor compounds
liquid-liquid microextraction
gas chromatography-tandem mass spectrometry
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Corresponding Author(s):
P. CHRIS WILSON
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Online First Date: 13 October 2015
Issue Date: 05 April 2016
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