PMID- 24558843
OWN - NLM
STAT- MEDLINE
DCOM- 20150708
LR  - 20190923
IS  - 1000-8713 (Print)
IS  - 1000-8713 (Linking)
VI  - 31
IP  - 11
DP  - 2013 Nov
TI  - [Solvent demulsification-dispersive liquid-liquid microextraction based on 
      solidification of floating organic drop coupled with gas chromatography-mass 
      spectrometry for simultaneous determination of organochlorine pesticides in 
      aqueous samples].
PG  - 1076-80
AB  - A novel method for simultaneous determination of eight organochlorine pesticides 
      in solidification of floating organic drop coupled with gas chromatography-mass 
      spectrometry (GC-MS) was established. A mixture of extractant (n-hexadecane) and 
      dispersive agent (acetone) at the ratio of 1/5 (v/v) was injected into aqueous 
      sample to form an emulsion and an extraction process was accomplished. The 
      demulsifier (750 microL acetone) was then injected to break up the emulsion. The 
      two phases were separated quickly without centrifugation. After being solidified 
      in an ice-bath, the upper layer (n-hexadecane) was transferred into an Eppendorf 
      tube and analyzed by GC-MS after melted at room temperature. Factors affecting 
      extraction efficiency such as the type and volume of extractant, dispersive agent 
      and demulsifier, also ionic strength and pH value of extraction system were 
      studied. Under the optimized conditions, the working curve of the proposed method 
      provided a good linearity in the range of 0.025-2.00 microg/L (r = 0.999 5-0.999 
      9). The detection limits of the organochlorine pesticides calculated by 
      Hubaux-Vos method were 0.012-0.024 microg/L and the relative standard deviations 
      (RSDs) ranged from 3.15% to 4.53%. The enrichment factors (EF) were 96-101. When 
      the method was applied to the determination of farmland water, the average spiked 
      recoveries were 96.77%-102.93% with the relative standard deviations of 
      2.68%-4.86%. The proposed method is sensitive and fast. It also has the advantage 
      of little organic solvent consumption so that it is friendly to environment and 
      suitable for batch analysis of organochlorine pesticides in aqueous samples. 
      Meanwhile, it provides technical and methodological support for achieving the 
      automation of sample pretreatment.
FAU - Wang, Yu
AU  - Wang Y
AD  - West China School of Public Health, Sichuan University, Key Laboratory of Food 
      Safety Risk Assessment and Monitoring of Sichuan Province, Chengdu 610041, China.
FAU - Zhu, Chenghua
AU  - Zhu C
AD  - West China School of Public Health, Sichuan University, Key Laboratory of Food 
      Safety Risk Assessment and Monitoring of Sichuan Province, Chengdu 610041, China.
FAU - Zou, Xiaoli
AU  - Zou X
AD  - West China School of Public Health, Sichuan University, Key Laboratory of Food 
      Safety Risk Assessment and Monitoring of Sichuan Province, Chengdu 610041, China.
FAU - Huang, Lizhi
AU  - Huang L
AD  - West China School of Public Health, Sichuan University, Key Laboratory of Food 
      Safety Risk Assessment and Monitoring of Sichuan Province, Chengdu 610041, China.
FAU - Yan, Dong
AU  - Yan D
AD  - West China School of Public Health, Sichuan University, Key Laboratory of Food 
      Safety Risk Assessment and Monitoring of Sichuan Province, Chengdu 610041, China.
LA  - chi
PT  - Journal Article
PL  - China
TA  - Se Pu
JT  - Se pu = Chinese journal of chromatography
JID - 9424804
RN  - 0 (Emulsions)
RN  - 0 (Hydrocarbons, Chlorinated)
RN  - 0 (Pesticide Residues)
RN  - 0 (Solvents)
RN  - 0 (Water Pollutants, Chemical)
RN  - 059QF0KO0R (Water)
SB  - IM
MH  - Emulsions
MH  - *Gas Chromatography-Mass Spectrometry
MH  - Hydrocarbons, Chlorinated/*analysis
MH  - *Liquid Phase Microextraction
MH  - Pesticide Residues/*analysis
MH  - Solvents
MH  - Water
MH  - Water Pollutants, Chemical/*analysis
EDAT- 2014/02/25 06:00
MHDA- 2015/07/15 06:00
CRDT- 2014/02/25 06:00
PHST- 2014/02/25 06:00 [entrez]
PHST- 2014/02/25 06:00 [pubmed]
PHST- 2015/07/15 06:00 [medline]
AID - 10.3724/sp.j.1123.2013.06008 [doi]
PST - ppublish
SO  - Se Pu. 2013 Nov;31(11):1076-80. doi: 10.3724/sp.j.1123.2013.06008.