Document Detail

A novel microextraction technique based on 1-hexylpyridinium hexafluorophosphate ionic liquid for the preconcentration of zinc in water and milk samples.
MedLine Citation:
PMID:  19699396     Owner:  NLM     Status:  MEDLINE    
A simple dispersive liquid-liquid microextraction methodology based on the application of 1-hexylpyridinium hexafluorophosphate [HPy][PF6] ionic liquid (IL) as an extractant solvent was proposed for the preconcentration of trace levels of zinc as a prior step to determination by flame atomic absorption spectrometry (FAAS). Zinc was complexed with 8-hydroxyquinoline (oxine) and extracted into ionic liquid. Some effective factors that influence the microextraction efficiency such as pH, oxine concentration, amount of IL, ionic strength, temperature and centrifugation time were investigated and optimized. In the optimum experimental conditions, the limit of detection (3 s) and the enhancement factor were 0.22 microg L(-1) and 71, respectively. The relative standard deviation (RSD) for six replicate determinations of 13 microg L(-1) Zn was 1.92%. In order to validate the developed method, a certified reference material (NIST SRM 1549) was analyzed and the determined values were in good agreement with the certified values. The proposed method was successfully applied to the trace determination of zinc in water and milk samples.
H Abdolmohammad-Zadeh; G H Sadeghi
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-07-21
Journal Detail:
Title:  Analytica chimica acta     Volume:  649     ISSN:  1873-4324     ISO Abbreviation:  Anal. Chim. Acta     Publication Date:  2009 Sep 
Date Detail:
Created Date:  2009-08-24     Completed Date:  2009-12-29     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370534     Medline TA:  Anal Chim Acta     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  211-7     Citation Subset:  IM    
Department of Chemistry, Faculty of Sciences, Azarbaijan University of Tarbiat Moallem, P.O. Box 53714-161, Tabriz, Iran.
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MeSH Terms
Hydrogen-Ion Concentration
Ionic Liquids / chemistry*
Milk / chemistry*
Osmolar Concentration
Oxyquinoline / chemistry
Pyridinium Compounds / chemistry*
Spectrophotometry, Atomic / methods*
Water / chemistry*
Zinc / analysis*,  isolation & purification
Reg. No./Substance:
0/1-hexylpyridinium; 0/Ionic Liquids; 0/Pyridinium Compounds; 148-24-3/Oxyquinoline; 7440-66-6/Zinc; 7732-18-5/Water

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