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Type: Artigo de periódico
Title: Dual-phase gas-permeation flow-injection thermometric analysis for the determination of carbon dioxide
Author: Liu, SJ
Tubino, M
Abstract: A flow-injection configuration based on a dual-phase gas-permeation system from a liquid donor to a gas acceptor stream with a thermistor flow-through detector is proposed for the direct analysis of the gas in the acceptor. This system was applied for the determination of carbon dioxide (in the form of carbonate) using the following chemical reaction: CO2(g) + 2NH(3)(g) + H2O(g)= (NH4)(2)CO3(s), with a linear response from 1 x 10(-3) to 50 x 10(-3) mol l(-1) of CO32-. Carbon dioxide was produced in the liquid donor and permeated into the gaseous acceptor stream of air/water vapor. The detection limit is 1 x 10(-3) mol l(-1) of carbonate, and a sampling frequency of 60 h(-1) is achieved with a relative standard deviation of 4.1% for replicate injections. The dual-phase gas-permeation flow-injection manifold, along with the membrane and phase separations, as well as the chemical reaction, provides enhanced selectivity when compared with the system employing a liquid acceptor stream, as serious interferents in this system, for instance, acetate and formate, among others, do not interfere in the proposed system. (C) 1998 Elsevier Science B.V. All rights reserved.
Subject: thermistor
carbon dioxide
gas permeation
flow-injection analysis
Country: Holanda
Editor: Elsevier Science Bv
Citation: Talanta. Elsevier Science Bv, v. 47, n. 3, n. 711, n. 717, 1998.
Rights: fechado
Identifier DOI: 10.1016/S0039-9140(98)00123-4
Date Issue: 1998
Appears in Collections:Unicamp - Artigos e Outros Documentos

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