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Type: Artigo de periódico
Title: A monosegmented-flow Karl Fischer titrator
Author: de Aquino, EV
Rohwedder, JJR
Pasquini, C
Abstract: A monosegmented volumetric Karl Fischer titrator is described to mechanize the determination of water content in organic solvents. The system is based on the flow-batch characteristics of the monosegmented analysis concept and employs biamperometry to monitor the progress of the titration. The system shows accuracy and precision that are highly independent of the flow rate, does not require calibration, and is carried out in a closed system capable of minimizing contact of the sample and reagents with ambient moisture. Sample volumes in the range of 40-300 mu L are employed, depending on the water concentration. An automatic dilution is provided to deal with concentrated samples. The consumption of Karl Fischer reagent depends on the water content of the sample but is not larger than 100 mu L. The system was evaluated for determination of water in ethanol and methanol in the range 0.02-0.5% (w/w). The average relative precision estimated in that range (9-3%) is comparable to that obtained with a larger volume commercial system and no significant difference was observed between the results obtained for the two systems at the 95% confidence level. A complete titration can be performed in less than 5 min employing the proposed system. (c) 2006 Elsevier B.V. All rights reserved.
Subject: water determination
mechanized titration
monosegmented analysis
Karl Fischer titration
flow-batch analysis
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/j.talanta.2006.06.034
Date Issue: 2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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