PMID- 22679837
OWN - NLM
STAT- MEDLINE
DCOM- 20130712
LR  - 20190923
IS  - 1000-8713 (Print)
IS  - 1000-8713 (Linking)
VI  - 30
IP  - 2
DP  - 2012 Feb
TI  - [Low-density solvent-based solvent demulsification dispersive liquid-liquid 
      microextraction combined with gas chromatography for determination of polycyclic 
      aromatic hydrocarbons in water samples].
PG  - 201-6
AB  - A novel method of low-density solvent-based solvent demulsification dispersive 
      liquid-liquid microextraction (SD-DLLME) was developed for the determination of 
      eight polycyclic aromatic hydrocarbons (PAHs) in water samples by gas 
      chromatography-flame ionization detection (GC-FID). Conventional DLLME methods 
      usually employ organic solvents heavier than water as the extraction solvents and 
      achieve the phase separation through centrifugation. On the contrary, in this 
      proposed extraction procedure, a mixture of low-density extraction solvent 
      (toluene) and dispersive solvent (acetone) was injected into the aqueous sample 
      solution to form an emulsion. A demulsification solvent (acetonitrile) was then 
      injected into the aqueous solution to break up the emulsion, which turned clear 
      quickly and was separated into two layers. The upper layer (toluene) was 
      collected and analyzed by GC. No centrifugation was required in this procedure. 
      Factors affecting the extraction efficiency such as the type and volume of 
      dispersive solvent, extraction solvent and de-emulsifier were investigated in 
      detail. Under the optimized conditions, the proposed method provided a good 
      linearity in the range of 20 - 500 microg/L (r2 = 0.994 2 - 0.999 9). The limits 
      of detection (S/N = 3) were in the range of 0.52 - 5.11 microg/L. The relative 
      standard deviations (RSDs) for the determination of 40 microg/L PAHs were in the 
      range of 2.2% - 13.6% (n = 5). The proposed method is fast, efficient and 
      convenient. It has been successfully applied to the determination of PAHs in 
      natural water samples with the spiked recoveries of 80.2% - 115.1%.
FAU - Zhu, Benqiong
AU  - Zhu B
AD  - Department of Chemistry, College of Science, Huazhong Agricultural University, 
      Wuhan 430070, China.
FAU - Chen, Hao
AU  - Chen H
FAU - Li, Shengqing
AU  - Li S
LA  - chi
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - China
TA  - Se Pu
JT  - Se pu = Chinese journal of chromatography
JID - 9424804
RN  - 0 (Emulsions)
RN  - 0 (Polycyclic Aromatic Hydrocarbons)
RN  - 0 (Solvents)
RN  - 0 (Water Pollutants, Chemical)
SB  - IM
MH  - Chromatography, Gas/*methods
MH  - Emulsions
MH  - Liquid Phase Microextraction/*methods
MH  - Polycyclic Aromatic Hydrocarbons/*analysis
MH  - Solvents
MH  - Water Pollutants, Chemical/*analysis
EDAT- 2012/06/12 06:00
MHDA- 2013/07/16 06:00
CRDT- 2012/06/12 06:00
PHST- 2012/06/12 06:00 [entrez]
PHST- 2012/06/12 06:00 [pubmed]
PHST- 2013/07/16 06:00 [medline]
AID - 10.3724/sp.j.1123.2011.10011 [doi]
PST - ppublish
SO  - Se Pu. 2012 Feb;30(2):201-6. doi: 10.3724/sp.j.1123.2011.10011.