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Plasma Jet Desorption Atomization-Atomic Fluorescence Spectrometry and Its Application to Mercury Speciation by Coupling with Thin Layer Chromatography.
MedLine Citation:
PMID:  23153091     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
A novel plasma jet desorption atomization (PJDA) source was developed for atomic fluorescence spectrometry (AFS) and coupled on line with thin layer chromatography (TLC) for mercury speciation. A dielectric barrier discharge plasma jet, which is generated inside a 300-μm quartz capillary, interacts directly with the sample being analyzed, and is found to desorb and atomize surface mercury species rapidly. The effectiveness of this PJDA surface sampling technique was demonstrated by measuring AFS signals of inorganic Hg2+, methylmercury (MeHg) and phenylmercury (PhHg) deposited directly on TLC plate. The detection limits of the proposed PJDA-AFS method for inorganic Hg2+, MeHg and PhHg were 0.51, 0.29 and 0.34 pg, respectively, and repeatability was 4.7%, 2.2% and 4.3% for 10 pg Hg2+, MeHg and PhHg. The proposed PJDA-AFS was also successfully coupled to TLC for mercury speciation. Under optimized conditions, the measurements of mercury dithizonate (Hg-D), methylmercury dithizonate (MeHg-D) and phenylmercury dithizonate (PhHg-D) could be achieved within 3 minutes with detection limits as low as 8.7 pg. The combination of TLC with PJDA-AFS provides a simple, cost-effective, relatively high-throughput way for mercury speciation.
Authors:
Zhifu Liu; Zhenli Zhu; Hongtao Zheng; Shenghong Hu
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-16
Journal Detail:
Title:  Analytical chemistry     Volume:  -     ISSN:  1520-6882     ISO Abbreviation:  Anal. Chem.     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370536     Medline TA:  Anal Chem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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