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Determination of lead in water samples by graphite furnace atomic absorption spectrometry after cloud point extraction.
MedLine Citation:
PMID:  18970270     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Cloud point extraction (CPE) has been used for the pre-concentration of lead, after the formation of a complex with 2-(5-bromo-2-pyridylazo)-5-(diethylamino)-phenol (5-Br-PADAP), and later analysis by graphite furnace atomic absorption spectrometry (GFAAS) using octylphenoxypolyethoxyethanol (TritonX-114) as surfactant. The chemical variables affecting the separation phase were optimized. Separation of the two phases was accomplished by centrifugation for 15min at 4000rpm. Under the optimum conditions i.e., pH 8.0, cloud point temperature 40 degrees C, [5-Br-PADAP]=2.5x10(-5)moll(-1), [Triton X-114]=0.05%, added methanol volume=0.15ml, pre-concentration of only 10ml sample permitted an enhancement factor of 50-fold. The lower limit of detection (LOD) obtained under the optimal conditions was 0.08mugl(-1). The precision for 10 replicate determinations at 5mugl(-1) Pb was 2.8% relative standard deviation (R.S.D.). The calibration graph using the pre-concentration system for lead was linear with a correlation coefficient of 0.9984 at levels near the detection limits up to at least 30mugl(-1). The method was successfully applied to the determination of lead in water samples.
Authors:
Jianrong Chen; Shanmei Xiao; Xiaohua Wu; Keming Fang; Wenhan Liu
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Talanta     Volume:  67     ISSN:  1873-3573     ISO Abbreviation:  Talanta     Publication Date:  2005 Oct 
Date Detail:
Created Date:  2008-10-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2984816R     Medline TA:  Talanta     Country:  England    
Other Details:
Languages:  eng     Pagination:  992-6     Citation Subset:  -    
Affiliation:
College of Chemistry and Life Science, Zhejiang Normal University, Jinhua, Zhejiang 321004, China.
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