PMID- 18760797
OWN - NLM
STAT- MEDLINE
DCOM- 20081216
LR  - 20090115
IS  - 0021-9673 (Print)
IS  - 0021-9673 (Linking)
VI  - 1207
IP  - 1-2
DP  - 2008 Oct 17
TI  - Microwave-assisted headspace controlled temperature liquid-phase microextraction 
      of chlorophenols from aqueous samples for gas chromatography-electron capture 
      detection.
PG  - 130-5
LID - 10.1016/j.chroma.2008.07.096 [doi]
AB  - A modified headspace liquid-phase microextraction (HS-LPME) method was studied 
      for the extraction of chlorophenols (CPs) from aqueous samples with complicated 
      matrices, before gas chromatographic (GC) analysis with electron capture 
      detection (ECD). Microwave heating was applied to accelerate the evaporation of 
      CPs into the headspace, and an external-cooling system was used to control the 
      sampling temperature. Conditions influencing extraction efficiency, such as the 
      LPME-solvent, the sampling position of LPME, the sampling temperature, microwave 
      power, and irradiation time (the same as sampling time), sample pH, and salt 
      addition were thoroughly optimized. Experimental results indicated that the 
      extraction of CPs from a 10mL aquatic sample (pH 1.0) was achieved with the best 
      efficiency through the use of 1-octanol as solvent, microwave irradiation of 
      167W, and sampling at 45 degrees C for 10min. The detections were linear in the 
      concentration of 5.0-100microg/L for 2,4-dichlorophenol (2,4-DCP), and 
      0.5-10microg/L for 2,4,6-trichlorophenol (2,4,6-TCP), 2,3,4,6-tetrachlorophenol 
      (2,3,4,6-TeCP) and pentachlorophenol (PCP). Detection limits were found to be 
      0.7, 0.04, 0.07, and 0.08microg/L for 2,4-DCP, 2,4,6-TCP, 2,3,4,6-TeCP, and PCP, 
      respectively. A landfill leachate sample was analyzed with recovery between 83 
      and 102%. The present method was proven to serve as a simple, sensitive, and 
      rapid procedure for CP analysis in an aqueous sample.
FAU - Shi, Yi-An
AU  - Shi YA
AD  - Department of Chemistry, National Chung-Hsing University, Taichung 402, Taiwan.
FAU - Chen, Ming-Zen
AU  - Chen MZ
FAU - Muniraj, Sarangapani
AU  - Muniraj S
FAU - Jen, Jen-Fon
AU  - Jen JF
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20080815
PL  - Netherlands
TA  - J Chromatogr A
JT  - Journal of chromatography. A
JID - 9318488
RN  - 0 (Chlorophenols)
SB  - IM
MH  - *Analytic Sample Preparation Methods/instrumentation/methods
MH  - Chlorophenols/*analysis
MH  - Chromatography, Gas/*methods
MH  - Microwaves
EDAT- 2008/09/02 09:00
MHDA- 2008/12/17 09:00
CRDT- 2008/09/02 09:00
PHST- 2007/02/28 00:00 [received]
PHST- 2008/07/23 00:00 [revised]
PHST- 2008/07/25 00:00 [accepted]
PHST- 2008/09/02 09:00 [pubmed]
PHST- 2008/12/17 09:00 [medline]
PHST- 2008/09/02 09:00 [entrez]
AID - S0021-9673(08)01395-2 [pii]
AID - 10.1016/j.chroma.2008.07.096 [doi]
PST - ppublish
SO  - J Chromatogr A. 2008 Oct 17;1207(1-2):130-5. doi: 10.1016/j.chroma.2008.07.096. 
      Epub 2008 Aug 15.