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Acid-induced homogenous liquid phase microextraction: Application of medium-chain carboxylic acid as extraction phase.
MedLine Citation:
PMID:  23408641     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
In this research, a novel homogeneous liquid phase microextraction method was successfully developed based on applying octanoic acid as low density extraction solvent. The method was applied for extraction and determination of chlorophenols as model compounds. Twelve milliliters of the sample solution was poured into a home-designed glass vial. Sixty microliters of octanoic acid was solved in water sample by adjusting pH and ionic strength. By rapid addition of 75 μL of concentrated HCl (6 M), a cloudy solution was obtained. Phase separation occurred at 5000 rpm for 5 min. After that, 20 μL of the collected phase (approximately 26 μL) was injected into the HPLC-UV instrument for analysis. The effect of some parameters such as the volume of concentrated HCl (phase separation reagent), ionic strength, extraction time, centrifugation time, and the volume of extracting phase on the extraction efficiency of the chlorophenols were investigated and optimized. The preconcentration factors in a range of 159-218 were obtained under the optimal conditions. The linear range, detection limits (S/N = 3), and precision (n = 3) were 1- 200, 0.3-0.5 μg/L and 4.6-5.1%, respectively. Tap water, sea water and river water samples were successfully analyzed for the existence of chlorophenols using the proposed method and satisfactory results were obtained.
Authors:
Behnam Ebrahimpour; Yadollah Yamini; Ali Esrafili
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-2-14
Journal Detail:
Title:  Journal of separation science     Volume:  -     ISSN:  1615-9314     ISO Abbreviation:  J Sep Sci     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-2-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101088554     Medline TA:  J Sep Sci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Affiliation:
Department of Chemistry, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran.
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