Document Detail


Experimental setup for the determination of analytes contained in ultrasonically levitated drops.
MedLine Citation:
PMID:  11220569     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
An automated technique for the determination of analytes in an ultrasonically levitated sample of 2 to 5 microL volume has been developed. Contactless dosing of reagents or solvents into an ultrasonically levitated drop was realized via piezoelectric micropumps. Drop size was continually controlled with a programmed CCD camera. A diode array spectrometer designed for the use with optical fibers was used for absorption and fluorescence measurements. Determinations via direct absorption measurements following the method of standard addition and acid-base titrations with an absorption indicator and a fluorescent indicator were carried out. The mean consumption of sodium hydroxide added via a piezoelectric micropump in five successive titrations with 18 nmol of sulfuric acid inside a levitated drop (indicator bromothymol blue) had a relative standard deviation of 0.7% and differed only by 0.2% from the expected value.
Authors:
O Rohling; C Weitkamp; B Neidhart
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Fresenius' journal of analytical chemistry     Volume:  368     ISSN:  0937-0633     ISO Abbreviation:  Fresenius J Anal Chem     Publication Date:    2000 Sep-Oct
Date Detail:
Created Date:  2001-02-23     Completed Date:  2001-03-22     Revised Date:  2003-10-31    
Medline Journal Info:
Nlm Unique ID:  9114077     Medline TA:  Fresenius J Anal Chem     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  125-9     Citation Subset:  -    
Affiliation:
Institut für Physikalische und Chemische Analytik, GKSS-Forschungszentrum Geesthacht GmbH, Germany.
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