PMID- 17574561
OWN - NLM
STAT- MEDLINE
DCOM- 20071001
LR  - 20090115
IS  - 0021-9673 (Print)
IS  - 0021-9673 (Linking)
VI  - 1161
IP  - 1-2
DP  - 2007 Aug 17
TI  - Determination of triazine herbicides in aqueous samples by dispersive 
      liquid-liquid microextraction with gas chromatography-ion trap mass spectrometry.
PG  - 89-97
AB  - A simple and rapid new dispersive liquid-liquid microextraction technique (DLLME) 
      coupled with gas chromatography-ion trap mass spectrometric detection (GC-MS) was 
      developed for the extraction and analysis of triazine herbicides from water 
      samples. In this method, a mixture of 12.0 microL chlorobenzene (extraction 
      solvent) and 1.00 mL acetone (disperser solvent) is rapidly injected by syringe 
      into the 5.00 mL water sample containing 4% (w/v) sodium chloride. In this 
      process, triazines in the water sample are extracted into the fine droplets of 
      chlorobenzene. After centrifuging for 5 min at 6000 rpm, the fine droplets of 
      chlorobenzene are sedimented in the bottom of the conical test tube (8.0+/-0.3 
      microL). The settled phase (2.0 microL) is collected and injected into the GC-MS 
      for separation and determination of triazines. Some important parameters, viz, 
      type of extraction solvent, identity and volume of disperser solvent, extraction 
      time, and salt effect, which affect on DLLME were studied. Under optimum 
      conditions the enrichment factors and extraction recoveries were high and ranged 
      between 151-722 and 24.2-115.6%, respectively. The linear range was wide (0.2-200 
      microg L(-1)) and the limits of detection were between 0.021 and 0.12 microg 
      L(-1) for most of the analytes. The relative standard deviations (RSDs) for 5.00 
      microg L(-1) of triazines in water were in the range of 1.36-8.67%. The 
      performance of the method was checked by analysis of river and tap water samples, 
      and the relative recoveries of triazines from river and tap water at a spiking 
      level of 5.0 microg L(-1) were 85.2-114.5% and 87.8-119.4%, respectively. This 
      method was also compared with solid-phase microextraction (SPME) and hollow fiber 
      protected liquid-phase microextraction (HFP-LPME) methods. DLLME is a very simple 
      and rapid method, requiring less than 3 min. It also has high enrichment factors 
      and recoveries for the extraction of triazines from water.
FAU - Nagaraju, Dongari
AU  - Nagaraju D
AD  - Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan.
FAU - Huang, Shang-Da
AU  - Huang SD
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20070529
PL  - Netherlands
TA  - J Chromatogr A
JT  - Journal of chromatography. A
JID - 9318488
RN  - 0 (Herbicides)
RN  - 0 (Solvents)
RN  - 0 (Triazines)
SB  - IM
MH  - Gas Chromatography-Mass Spectrometry/*methods
MH  - Herbicides/*analysis
MH  - Reference Standards
MH  - Solvents/chemistry
MH  - Triazines/*analysis
EDAT- 2007/06/19 09:00
MHDA- 2007/10/02 09:00
CRDT- 2007/06/19 09:00
PHST- 2007/02/07 00:00 [received]
PHST- 2007/05/18 00:00 [revised]
PHST- 2007/05/22 00:00 [accepted]
PHST- 2007/06/19 09:00 [pubmed]
PHST- 2007/10/02 09:00 [medline]
PHST- 2007/06/19 09:00 [entrez]
AID - S0021-9673(07)00946-6 [pii]
AID - 10.1016/j.chroma.2007.05.065 [doi]
PST - ppublish
SO  - J Chromatogr A. 2007 Aug 17;1161(1-2):89-97. doi: 10.1016/j.chroma.2007.05.065. 
      Epub 2007 May 29.