Document Detail

A critical comparison of analytical flow systems exploiting streamlined and pulsed flows.
MedLine Citation:
PMID:  17522849     Owner:  NLM     Status:  MEDLINE    
Multipumping (MPFS) and multicommuted (MCFS) flow systems relying on pulsed and laminar flows were critically compared. The mixing conditions and dispersion associated with both systems were evaluated by simulating the sample with bromocresol green. The molybdenum blue method for phosphate determination in soil extracts was also implemented in both flow systems. Furthermore, laser-induced fluorescence (LIF) was applied to visualize the dispersing sample; rhodamine B was used as the fluorescent species. The pulsed flow enhanced the mixing of the solutions involved, thus reducing reagent consumption (48 and 96 microl for MPFS and MCFS), and improving sampling rate (67 and 144 h(-1) for MCFS and MPFS). For phosphate determination, results obtained with both systems were precise (r.s.d. < 0.5%; n = 10) and accurate. Analyses of the absorbance vs time/space LIF plots revealed that exploitation of pulsed flow led to a pronounced radial dispersion and to a limited axial dispersion, typical aspects of turbulent flows.
Ana C B Dias; Joâo L M Santos; José L F C Lima; Cristina M Quintella; Angelo M V Lima; Elias A G Zagatto
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-05-24
Journal Detail:
Title:  Analytical and bioanalytical chemistry     Volume:  388     ISSN:  1618-2642     ISO Abbreviation:  Anal Bioanal Chem     Publication Date:  2007 Jul 
Date Detail:
Created Date:  2007-07-05     Completed Date:  2007-08-20     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  101134327     Medline TA:  Anal Bioanal Chem     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  1303-10     Citation Subset:  IM    
Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, Piracicaba, SP, Brazil.
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MeSH Terms
Bromcresol Green / analysis
Chemistry Techniques, Analytical / methods*
Fluorescent Dyes / chemistry
Models, Chemical
Models, Theoretical
Molybdenum / analysis
Phosphates / analysis,  chemistry
Reproducibility of Results
Spectrometry, Fluorescence
Time Factors
Reg. No./Substance:
0/Fluorescent Dyes; 0/Phosphates; 0/Solutions; 40957-85-5/molybdenum blue; 7439-98-7/Molybdenum; 76-60-8/Bromcresol Green

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