PMID- 18161333
OWN - NLM
STAT- MEDLINE
DCOM- 20100617
LR  - 20161018
IS  - 1000-8713 (Print)
IS  - 1000-8713 (Linking)
VI  - 25
IP  - 5
DP  - 2007 Sep
TI  - [Determination of acetanilide herbicide residues in tea by gas 
      chromatography-mass spectrometry with two different ionization techniques].
PG  - 753-7
AB  - An analytical method of solid phase extraction-gas chromatography-mass 
      spectrometry with two different ionization techniques was established for 
      simultaneous determination of 12 acetanilide herbicide residues in tea-leaves. 
      Herbicides were extracted from tea-leaf samples with ethyl acetate. The extract 
      was cleaned-up on an active carbon SPE column connected to a Florisil SPE column. 
      Analytical screening was determined by the technique of gas chromatography 
      (GC)-mass spectrometry (MS) in the selected ion monitoring (SIM) mode with either 
      electron impact ionization (EI) or negative chemical ionization (NCI). It is 
      reliable and stable that the recoveries of all herbicides were in the range from 
      50% to 110% at three spiked levels, 10 microg/kg, 20 microg/kg and 40 microg/kg, 
      and the relative standard deviations (RSDs) were no more than 10.9%. The two 
      different ionization techniques are complementary as more ion fragmentation 
      information can be obtained from the EI mode while more molecular ion information 
      from the NCI mode. By comparison of the two techniques, the selectivity of 
      NCI-SIM was much better than that of EI-SIM method. The sensitivities of the both 
      techniques were high, the limit of quantitative (LOQ) for each herbicide was no 
      more than 2.0 microg/kg, and the limit of detection (LOD) with NCI-SIM technique 
      was much lower than that of EI-SIM when analyzing herbicides with several halogen 
      atoms in the molecule.
FAU - Shen, Weijian
AU  - Shen W
AD  - Laboratory of Food, Jiangsu Entry-Exit Inspection and Quarantine Bureau, Nanjing 
      210001, China. swj9722418@yahoo.com.cn
FAU - Xu, Jinzhong
AU  - Xu J
FAU - Yang, Wenquan
AU  - Yang W
FAU - Shen, Chongyu
AU  - Shen C
FAU - Zhao, Zengyun
AU  - Zhao Z
FAU - Ding, Tao
AU  - Ding T
FAU - Wu, Bin
AU  - Wu B
LA  - chi
PT  - English Abstract
PT  - Journal Article
PL  - China
TA  - Se Pu
JT  - Se pu = Chinese journal of chromatography
JID - 9424804
RN  - 0 (Acetanilides)
RN  - 0 (Herbicides)
RN  - 0 (Tea)
RN  - SP86R356CC (acetanilide)
SB  - IM
MH  - Acetanilides/*analysis
MH  - Gas Chromatography-Mass Spectrometry/*methods
MH  - Herbicides/*analysis
MH  - Limit of Detection
MH  - Tea/*chemistry
EDAT- 2007/12/29 09:00
MHDA- 2010/06/18 06:00
CRDT- 2007/12/29 09:00
PHST- 2007/12/29 09:00 [pubmed]
PHST- 2010/06/18 06:00 [medline]
PHST- 2007/12/29 09:00 [entrez]
PST - ppublish
SO  - Se Pu. 2007 Sep;25(5):753-7.