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Title: | Determination of Cl<sup>-</sup>, Br<sup>-</sup>, I<sup>-</sup>, Mn<sup>2+</sup>, malonic acid and quercetin by perturbation of a non-equilibrium stationary state in the Bray-Liebhafsky reaction | Authors: | Vukojević, Vladana B. Pejić, Nataša D. Stanisavljev, Dragomir Anić, Slobodan Kolar-Anić, Ljiljana |
Issue Date: | 1-Jan-1999 | Journal: | Analyst | Abstract: | A new method applying a non-linear chemical system under conditions far from thermodynamic equilibrium in microvolume/microconcentration quantitative analysis is described. The chemical system used as a matrix is the Bray-Liebhafsky reaction in a non-equilibrium stationary state close to a bifurcation point. The method is based on monitoring the response of this system to perturbations by Cl-, Br-, I-, Mn2+, malonic acid and quercetin analyte solutions, which are followed potentiometrically either by an Ag+/S2- ion-sensitive or by a Pt electrode. A linear response of the potential shift versus the logarithm of the analyte concentrations is found in the following ranges: 1.3 X 10-6 mol dm-3 ≤ [Cl-] ≤ 1.6 x 10-4 mol dm-3, 1.0 x 10-6 mol dm-3 ≤ [Br-] ≤ 8.3 x 10-5 mol dm-3, 2.0 x 10-6 mol dm-3 ≤ [I-] ≤ 1.0 x 10-4 mol dm-3, 8.4 x 10-7 mol dm-3 ≤ [Mn2+] ≤ 8.3 x 10-5 mol dm-3, 3.8 x 10-7 mol dm-3 ≤ [malonic acid] ≤ 2.1 x 10-5 mol dm-3 and 1.5 x 10-8 mol dm-3 ≤ [quercetin] ≤ 3.7 x 10-5 mol dm-3. Under the investigated conditions an improved detection limit for all halides tested is obtained. Unknown concentrations of the analytes can be determined from a standard series of calibration curves to an accuracy within ± 5%. In addition, the application of potentiometric measurements in microvolume/microconcentration quantitative analysis is diversified. |
URI: | https://dspace.ffh.bg.ac.rs/handle/123456789/1161 | ISSN: | 0003-2654 | DOI: | 10.1039/a807608a |
Appears in Collections: | Journal Article |
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