Contact Info
Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf
Gravimetry
Classification:
Gravimetry
Citations 3
"Analytical Balance As A Detector In Flow Analysis"
Anal. Chim. Acta
1992 Volume 258, Issue 1 Pages 129-133
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Abstract:
A continuous-flow system with gravimetric detection is proposed. Sample and reagents are injected into air carrier streams and the ppt. yielded after merging the streams is retained by a filtration unit placed on analytical balance; after drying, the ppt. is weighed. Dissolution and filter conditioning under segmented-flow conditions are achieved by passing washing solution through the filter. The potential and limitations of the approach, the need for a calibration graph and the main parameters involved were studied using a model system based on barium oxalate. The coefficient of variation were ~3% and sample throughput was 30 h-1. A continuous-flow system with gravimetric detection is proposed. Samples and reagents are injected into air carrier streams and the ppt. yielded after merging of these streams is retained by a filtration unit, placed on the plate of an anal. balance. After partial and reproducible drying, the ppt. is weighed. Dissolution and filter conditioning under segmented-flow conditions are thereafter achieved by passing intermittent washing solutions through the filter. The potential and limitations of the approach, the need for a calibration graph and the main parameters involved were studied with a model system based on barium oxalate. The system handles ~30 samples h-1, yielding results in agreement with expected values (relative standard deviation ~3%).
Precipitation
Filter
"Determination Of Reducing Sugars By Flow Injection Gravimetry"
Anal. Chim. Acta
1998 Volume 366, Issue 1-3 Pages 119-125
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Sartini, Cl&aacute;udio C. Oliveira, Elias A. G. Zagatto* and H. Bergamin Filho'include - APP/View/Elements/citation.ctp, line 40 View::_evaluate() - CORE/Cake/View/View.php, line 971 View::_render() - CORE/Cake/View/View.php, line 933 View::_renderElement() - CORE/Cake/View/View.php, line 1224 View::element() - CORE/Cake/View/View.php, line 418 include - APP/View/Techniques/view.ctp, line 52 View::_evaluate() - CORE/Cake/View/View.php, line 971 View::_render() - CORE/Cake/View/View.php, line 933 View::render() - CORE/Cake/View/View.php, line 473 Controller::render() - CORE/Cake/Controller/Controller.php, line 968 Dispatcher::_invoke() - CORE/Cake/Routing/Dispatcher.php, line 200 Dispatcher::dispatch() - CORE/Cake/Routing/Dispatcher.php, line 167 [main] - APP/webroot/index.php, line 109
Abstract:
A flow injection procedure for gravimetric determination of reducing sugars was developed. The system was designed to permit the monitoring of an inline formed suspension. In view of the high density of the ppt., a product of oxidation of reducing sugars by Fehling reagent, the Archimedes principle was exploited, so that the ppt. was weighed inside the flowing stream. Sample and reagents were simultaneously injected into two convergent carrier streams flowing through a reaction coil immersed in boiling water under reflux. The ppt. was formed, cooled, accumulated on a sintered glass mini-filter and weighed. An acidic solution was then injected into both carrier streams to promote inline solubilization of the ppt. Characteristics of the filtering device, geometry of the debubbler, flow rates, wash solution and possibilities of weighing with the filtering unit on the plate of the anal. balance or suspended under it were studied. Also, effects of reagent concentration, temp., surfactant addition and available time for reaction were studied. The gravimetric flow injection system was very stable and required only 0.64 g Cu2+ per determination Ppt. drying was not needed. Precise results (relative standard deviation usually <0.9%), in agreement with an official titrimetric procedure, were obtained within 0.20 and 1.00%(w/v) invert sugar. A new weighing was accomplished every 6th minute.
Sugars, reducing
Suspension
Precipitation
Method comparison
Filter
Debubbler
Optimization
Surfactant
"Analytical Balance As A Detector For Flow Analysis"
J. Flow Injection Anal.
1992 Volume 9, Issue 1 Pages 84-84
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Acta', 'journal_id' => '0584', 'fadid' => 'ANCA1992V0258P00129', 'year' => '1992', 'volume' => '258', 'issue' => '1', 'startpage' => '129', 'endpage' => '133', 'type' => 'Journal Article', 'analytes' => '', 'matrices' => '', 'techniques' => ';0266;', 'keywords' => ';0347;0160;', 'abstract' => 'A continuous-flow system with gravimetric detection is proposed. Sample and reagents are injected into air carrier streams and the ppt. yielded after merging the streams is retained by a filtration unit placed on analytical balance; after drying, the ppt. is weighed. Dissolution and filter conditioning under segmented-flow conditions are achieved by passing washing solution through the filter. The potential and limitations of the approach, the need for a calibration graph and the main parameters involved were studied using a model system based on barium oxalate. The coefficient of variation were ~3% and sample throughput was 30 h-1. 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Abstract:
How to interface an analytical balance into a flow system