PMID- 18179801
OWN - NLM
STAT- MEDLINE
DCOM- 20080505
LR  - 20181201
IS  - 0021-9673 (Print)
IS  - 0021-9673 (Linking)
VI  - 1180
IP  - 1-2
DP  - 2008 Feb 8
TI  - Mixed hemimicelles solid-phase extraction based on cetyltrimethylammonium 
      bromide-coated nano-magnets Fe3O4 for the determination of chlorophenols in 
      environmental water samples coupled with liquid chromatography/spectrophotometry 
      detection.
PG  - 24-31
LID - 10.1016/j.chroma.2007.12.028 [doi]
AB  - Mixed hemimicelles solid-phase extraction (SPE) based on cetyltrimethylammonium 
      bromide (CTAB)-coated nano-magnets Fe3O4 was investigated for the 
      preconcentration of four chlorophenols (CPs) in environmental water samples prior 
      to HPLC-spectrophotometry determination in this paper. By the rapid isolating 
      (about 5 min) of Fe3O4 nanoparticles (NPs) through placing a Nd-Fe-B strong 
      magnet on the bottom of beaker, the time-consuming preconcentration process of 
      loading large volume sample in conversional SPE method with a column can be 
      avoided. The unique properties of Fe3O4 NPs such as high surface area and strong 
      magnetism were utilized adequately in the SPE process. This novel separation 
      method produced a high preconcentration rate and factor. A comprehensive study of 
      the adsorption conditions such as the Fe3O4 NPs zeta-potential, CTAB added 
      amounts, pH value, standing time and maximal extraction volume was also 
      presented. Under optimized conditions, four analytes of 2-chlorophenol (2-CP), 
      2,4-dichlorophenol (2,4-DCP), 2,4,6-trichlorophenol (TCP) and pentachlorophenol 
      (PCP) were quantitatively extracted. The method was then used to determine four 
      CPs in five real environmental water samples. High concentration factors (700) 
      were achieved for each of the analytes, with observed detection limits ranging 
      between 0.11 and 0.15 microg L(-1). The accuracy of method was evaluated by 
      recovery measurements on spiked samples. Good recovery results (83-98%) with 
      satisfactory relative standard deviation (RSD) were achieved. It is important to 
      note that satisfactory preconcentration factors and extraction recoveries for the 
      four CPs were obtained with only a little amount of Fe3O4 NPs (0.1g) and CTAB (60 
      mg). To the best of our knowledge, this was the first time a mixed hemimicelles 
      SPE method based on Fe3O4 NPs magnetic separation had been used for the 
      pretreatment of environmental water samples.
FAU - Li, Jidong
AU  - Li J
AD  - State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research 
      Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 
      100085, China.
FAU - Zhao, Xiaoli
AU  - Zhao X
FAU - Shi, Yali
AU  - Shi Y
FAU - Cai, Yaqi
AU  - Cai Y
FAU - Mou, Shifen
AU  - Mou S
FAU - Jiang, Guibin
AU  - Jiang G
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20071223
PL  - Netherlands
TA  - J Chromatogr A
JT  - Journal of chromatography. A
JID - 9318488
RN  - 0 (Cetrimonium Compounds)
RN  - 0 (Chlorophenols)
RN  - 0 (Ferric Compounds)
RN  - 0 (Micelles)
RN  - 0 (Surface-Active Agents)
RN  - 0 (Water Pollutants, Chemical)
RN  - 1K09F3G675 (ferric oxide)
RN  - Z7FF1XKL7A (Cetrimonium)
SB  - IM
MH  - Adsorption
MH  - Cetrimonium
MH  - Cetrimonium Compounds/*chemistry
MH  - Chlorophenols/*analysis
MH  - Chromatography, High Pressure Liquid/*methods
MH  - Ferric Compounds/*chemistry
MH  - Hydrogen-Ion Concentration
MH  - Mass Spectrometry/*methods
MH  - *Micelles
MH  - *Nanostructures
MH  - Surface-Active Agents/chemistry
MH  - Water Pollutants, Chemical/*analysis
EDAT- 2008/01/09 09:00
MHDA- 2008/05/06 09:00
CRDT- 2008/01/09 09:00
PHST- 2007/07/16 00:00 [received]
PHST- 2007/12/07 00:00 [revised]
PHST- 2007/12/11 00:00 [accepted]
PHST- 2008/01/09 09:00 [pubmed]
PHST- 2008/05/06 09:00 [medline]
PHST- 2008/01/09 09:00 [entrez]
AID - S0021-9673(07)02181-4 [pii]
AID - 10.1016/j.chroma.2007.12.028 [doi]
PST - ppublish
SO  - J Chromatogr A. 2008 Feb 8;1180(1-2):24-31. doi: 10.1016/j.chroma.2007.12.028. 
      Epub 2007 Dec 23.