PMID- 18837477
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20090122
LR  - 20081103
IS  - 1615-9314 (Electronic)
IS  - 1615-9306 (Linking)
VI  - 31
IP  - 20
DP  - 2008 Oct
TI  - Multiwalled carbon nanotubes as solid-phase extraction materials for the gas 
      chromatographic determination of organophosphorus pesticides in waters.
PG  - 3612-9
LID - 10.1002/jssc.200800352 [doi]
AB  - In the present work, a GC method with nitrogen-phosphorus detection (NPD) was 
      developed for the simultaneous determination of eight organophosphorus pesticide 
      (OPP) residues (i.e., ethoprofos, diazinon, chlorpyrifos-methyl, fenitrothion, 
      malathion, chlorpyrifos, fenamiphos, and buprofezin) in water samples. 
      Preconcentration of the water samples was carried out using an SPE procedure with 
      multiwalled carbon nanotubes (MWCNTs) of 10-15 nm od, 2-6 nm id, and 0.1-10 
      microm length as stationary phase. Extraction parameters, such as the amount of 
      MWCNTs, sample volume, pH, and type and amount of the eluent were optimized. The 
      most favorable conditions were as follows: 40 mg MWCNTs, 800 mL water, pH 6.0, 
      and 20 mL dichloromethane, respectively. The MWCNTs-SPE-GC-NPD method was applied 
      to the determination of these pesticides in real water samples: mineral and 
      ground water as well as run-off water from an agricultural area collected shortly 
      before opening out onto the sea. A recovery study was developed with five 
      consecutive extractions of the three types of water spiked at three concentration 
      levels (n = 15). Mean recovery values were in the range of 75-116% for mineral 
      water (RSD < 6.3%), 67-119% for ground water (RSD < 5.8%), and 57-81% for run-off 
      waters (RSDs < 6.9%), except for fenamiphos (mean recovery values between 40 and 
      84% for the three types of waters, RSDs < 8.9%). LODs were in the low ng/L level 
      (i.e., levels below the maximum residue limits (MRLs) established by the European 
      Union (EU) legislation for these compounds in waters). The proposed method was 
      also applied to the analysis of six water samples (two of each type: mineral, 
      ground, and run-off waters) in which no residues of the selected pesticides were 
      found. Results show that the MWCNTs used in this work have a high adsorbability 
      of the pesticides under study. The main advantage of the use of these MWCNTs is 
      their low cost when compared with those MWCNTs previously used in the literature 
      and with conventional SPE cartridges.
FAU - Ravelo-Perez, Lidia M
AU  - Ravelo-Perez LM
AD  - Department of Analytical Chemistry, Nutrition and Food Science, University of La 
      Laguna, Tenerife, Canary Islands, Spain.
FAU - Hernandez-Borges, Javier
AU  - Hernandez-Borges J
FAU - Angel Rodriguez-Delgado, Miguel
AU  - Angel Rodriguez-Delgado M
LA  - eng
PT  - Journal Article
PL  - Germany
TA  - J Sep Sci
JT  - Journal of separation science
JID - 101088554
EDAT- 2008/10/08 09:00
MHDA- 2008/10/08 09:01
CRDT- 2008/10/08 09:00
PHST- 2008/10/08 09:00 [pubmed]
PHST- 2008/10/08 09:01 [medline]
PHST- 2008/10/08 09:00 [entrez]
AID - 10.1002/jssc.200800352 [doi]
PST - ppublish
SO  - J Sep Sci. 2008 Oct;31(20):3612-9. doi: 10.1002/jssc.200800352.