PMID- 19071629
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20121002
LR  - 20081216
IS  - 1873-3573 (Electronic)
IS  - 0039-9140 (Linking)
VI  - 72
IP  - 2
DP  - 2007 Apr 30
TI  - Part-per-trillion determination of chlorobenzenes in water using dispersive 
      liquid-liquid microextraction combined gas chromatography-electron capture 
      detection.
PG  - 387-93
LID - 10.1016/j.talanta.2006.10.039 [doi]
AB  - In this study, a simple, rapid and efficient method, dispersive liquid-liquid 
      microextraction (DLLME) combined gas chromatography-electron capture detection 
      (GC-ECD), for the determination of chlorobenzenes (CBs) in water samples, has 
      been described. This method involves the use of an appropriate mixture of 
      extraction solvent (9.5 microl chlorobenzene) and disperser solvent (0.50 ml 
      acetone) for the formation of cloudy solution in 5.00 ml aqueous sample 
      containing analytes. After extraction, phase separation was performed by 
      centrifugation and the enriched analytes in sedimented phase were determined by 
      gas chromatography-electron capture detection (GC-ECD). Our simple conditions 
      were conducted at room temperature with no stiring and no salt addition in order 
      to minimize sample preparation steps. Parameters such as the kind and volume of 
      extraction solvent, the kind and volume of disperser solvent, extraction time and 
      salt effect, were studied and optimized. The method exhibited enrichment factors 
      and recoveries ranging from 711 to 813 and 71.1 to 81.3%, respectively, within 
      very short extraction time. The linearity of the method ranged from 0.05 to 100 
      microgl(-1) for dichlorobenzene isomers (DCB), 0.002-20 microgl(-1) for 
      trichlorobenzene (TCB) and tetrachlorobenzene (TeCB) isomers and from 0.001 to 4 
      microgl(-1) for pentachlorobenzene (PeCB) and hexachlorobenzene (HCB). The limit 
      of detection was in the low microgl(-1) level, ranging between 0.0005 and 0.05 
      microgl(-1). The relative standard deviations (R.S.D.s) for the concentration of 
      DCB isomers, 5.00 microgl(-1), TCB and TeCB isomers, 0.500 microgl(-1), PeCB and 
      HCB 0.100 microgl(-1) in water by using the internal standard were in the range 
      of 0.52-2.8% (n=5) and without the internal standard were in the range of 
      4.6-6.0% (n=5). The relative recoveries of spiked CBs at different levels of 
      chlorobenzene isomers in tap, well and river water samples were 109-121%, 
      105-113% and 87-120%, respectively. It is concluded that this method can be 
      successfully applied for the determination of CBs in tap, river and well water 
      samples.
FAU - Kozani, Reyhaneh Rahnama
AU  - Kozani RR
AD  - School of Chemistry, University College of Science, University of Tehran, Tehran, 
      Iran.
FAU - Assadi, Yaghoub
AU  - Assadi Y
FAU - Shemirani, Farzaneh
AU  - Shemirani F
FAU - Hosseini, Mohammad-Reza Milani
AU  - Hosseini MR
FAU - Jamali, Mohammad Reza
AU  - Jamali MR
LA  - eng
PT  - Journal Article
DEP - 20061127
PL  - Netherlands
TA  - Talanta
JT  - Talanta
JID - 2984816R
EDAT- 2007/04/30 00:00
MHDA- 2007/04/30 00:01
CRDT- 2008/12/17 09:00
PHST- 2006/08/01 00:00 [received]
PHST- 2006/10/19 00:00 [revised]
PHST- 2006/10/20 00:00 [accepted]
PHST- 2008/12/17 09:00 [entrez]
PHST- 2007/04/30 00:00 [pubmed]
PHST- 2007/04/30 00:01 [medline]
AID - S0039-9140(06)00725-9 [pii]
AID - 10.1016/j.talanta.2006.10.039 [doi]
PST - ppublish
SO  - Talanta. 2007 Apr 30;72(2):387-93. doi: 10.1016/j.talanta.2006.10.039. Epub 2006 
      Nov 27.