Published:Journal of Chromatographic Science,
ISSN 0021-9665 Volume 44,
Number 10, November/December 2006, pp.619-624
Determination of Phenolic Compounds in Wastewater
by Liquid-Phase Microextraction Coupled with Gas Chromatography
Taozhi Zhang, Xinmiao Chen, Pei Liang, and Cuixia
Liu
Key Laboratory of Pesticide and Chemical Biology of Ministry of
Education, Central China Normal University, Wuhan, Hubei 430079,
P.R. China
Liquid-phase microextraction (LPME) coupled with
gas chromatography–flame ionization detection is applied
to the analysis of phenolic compounds (phenol, o-cresol, m-cresol,
2,4-dimethylphenol, 2,3- dimethylphenol, and 3,4-dimethylphenol)
in water samples. Experimental parameters affecting the extraction
efficiency (including extraction solvent and drop volume, stirring
rate, extraction time, temperature, salt concentration, and pH)
are investigated and optimized. The developed protocol yields
a good linear calibration curve from 5 or 20 to 10000 µg/L
for the target analytes. The limits of detection are in the range
of 0.94 to 1.97 µg/L, and the relative standard deviation
is below 9.37%. The established method is applied to determine
the phenolic pollutants in real wastewater samples from a coking
plant. The recoveries of the phenolic compounds studied are from
92% to 102%, suggesting the feasibility of the LPME method for
the determination of the phenolic compounds in wastewater.
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