PMID- 17920393
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20071113
LR  - 20071008
IS  - 1873-4324 (Electronic)
IS  - 0003-2670 (Linking)
VI  - 601
IP  - 2
DP  - 2007 Oct 10
TI  - Fiber optic-linear array detection spectrophotometry in combination with cloud 
      point extraction for simultaneous preconcentration and determination of cobalt 
      and nickel.
PG  - 204-11
AB  - A new combined method including fiber optic-linear array detection 
      spectrophotometry (FO-LADS) and cloud point extraction (CPE) was developed using 
      a cylindrical micro cell for simultaneous preconcentration and determination of 
      different species. The CPE and FO-LADS methods have good matching conditions for 
      combination because FO-LADS is suitable as a detection technique for the low 
      volume of remained phase obtained after CPE. This combination was carried out 
      using 50 microL cylindrical micro cell and then employed for simultaneous 
      preconcentration and determination of cobalt and nickel. Cloud point extraction 
      method was based on the chromogenic reaction of metal ions and 
      1-(2-pyridylazo)-2-naphthol (PAN) and then preconcentration of formed complexes 
      using octylphenoxypolyethoxyethanol (Triton X-114). The remained phase after CPE 
      was transferred into cylindrical micro cell and located at the cell holder of 
      FO-LADS. The spectra of cobalt and nickel complexes were collected by FO-LADS and 
      processed for ordinary and first derivative spectrophotometry. Optimization of 
      different parameters was evaluated. Under optimum conditions, calibration curves 
      were linear in the range of 0.6-30.0 and 0.1-15.0 microg L(-1) with detection 
      limits of 0.2 and 0.04 microg L(-1) for Co and Ni respectively. The relative 
      standard deviations (R.S.D.s) were lower than 4%. The obtained enhancement 
      factors were 198 and 199 for cobalt and nickel, respectively. The proposed method 
      was compared with the other methods and applied to the analysis of several real 
      and spiked samples.
FAU - Shokoufi, N
AU  - Shokoufi N
AD  - Department of Analytical Chemistry, Faculty of Chemistry, University College of 
      Science, The University of Tehran, P.O. Box 14155-6455, Tehran, Iran.
FAU - Shemirani, F
AU  - Shemirani F
FAU - Memarzadeh, F
AU  - Memarzadeh F
LA  - eng
PT  - Journal Article
DEP - 20070831
PL  - Netherlands
TA  - Anal Chim Acta
JT  - Analytica chimica acta
JID - 0370534
EDAT- 2007/10/09 09:00
MHDA- 2007/10/09 09:01
CRDT- 2007/10/09 09:00
PHST- 2007/04/21 00:00 [received]
PHST- 2007/08/15 00:00 [revised]
PHST- 2007/08/23 00:00 [accepted]
PHST- 2007/10/09 09:00 [pubmed]
PHST- 2007/10/09 09:01 [medline]
PHST- 2007/10/09 09:00 [entrez]
AID - S0003-2670(07)01442-0 [pii]
AID - 10.1016/j.aca.2007.08.042 [doi]
PST - ppublish
SO  - Anal Chim Acta. 2007 Oct 10;601(2):204-11. doi: 10.1016/j.aca.2007.08.042. Epub 
      2007 Aug 31.