Citation: DU Xiao-Di, CAI Hong-Wei, GUO Li-Ping, LEI Jia-Heng. Determination of Volatile Halogenated Hydrocarbon in Drinking Water Using Dispersive Liquid-Liquid Microextraction with Biphenyl-Biphenyl Ether Mixture as Extractants[J]. Chinese Journal of Analytical Chemistry, ;2018, 46(9): 1493-1500. doi: 10.11895/j.issn.0253-3820.181176 shu

Determination of Volatile Halogenated Hydrocarbon in Drinking Water Using Dispersive Liquid-Liquid Microextraction with Biphenyl-Biphenyl Ether Mixture as Extractants

Department of Chemistry, School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430070, China

Received Date: 20 March 2018
Revised Date: 8 May 2018

Fund Project: This work was supported by the National Natural Science Foundation of China (No. 21476177).

A method for determination of seven volatile halogenated hydrocarbons in drinking water by dispersive liquid-liquid microextraction-gas chromatography with electron capture detection was developed. Biphenyl-biphenyl ether mixture, as a non-chlorinated organic solvent, was used as extractant. The extractant could be separated easily by centrifugation because of its high density, and the extraction process could be completed within 3 min. The amount of extractants, types and amount of dispersants, extraction time and extraction temperature were optimized. For the extraction of seven volatile halogenated hydrocarbons from 5.00 mL aqueous sample, 200 μL of extractant and 0.30 mL of methanol as disperser solvent were used, and the extraction equilibrium could be reached within 30 s with a high extraction recovery of over 90%. In addition, the enrichment factor reached a high value of 22.5-24.7. The sediment phase was injected and analyzed by gas chromatography with DB-624 column and detected by electron capture detector. The limit of detection of this method was 0.003-0.032 μg/L based on S/N=3. The linear range for chloroform was from 0.500 μg/L to 100.0 μg/L, for trichloroethylene and bromoform was from 0.100 μg/L to 20.0 μg/L, for perchlormethane, bromodichloromethan, dibromochloromethane and perchloroethylene was from 0.100 μg/L to 10.0 μg/L, while the correlation coefficients (R²) were no less than 0.998. The relative standard deviations of this method were 2.1%-7.6%. At different concentration levels, the relative recoveries ranged from 93.0% to 102.9%.
- Gas chromatography,
- Dispersive liquid-liquid microextraction,
- Non-chlorinated extractant,
- Volatile halogenated hydrocarbon,
- Disinfection byproducts,
- Drinking water
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