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Titre du document / Document title

Determination of the selectivity coefficient of a chloride ion selective electrode in alkaline media simulating the cement paste pore solution

Auteur(s) / Author(s)

DE VERA G. (1) ; CLIMENT M. A. (1) ; ANTON C. (2) ; HIDALGO A. (2) ; ANDRADE C. (2) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Departament d'Enginyeria de la Construcció, Obres Públiques i Infrastructura Urbana, Universitat d'Alacant, Ap. 99, 03080 Alacant/Alicante, ESPAGNE
(2) Instituto de Ciencias de la Construcción Eduardo Torroja, CSIC, C/Serrano Galvache s/n, 28033 Madrid, ESPAGNE

Résumé / Abstract

The measurement of the free chloride concentration in the pore solution of cement paste or concrete is of interest for assessing the probability of corrosion of the steel reinforcements embedded in concrete. This determination is performed through leaching or pore-pressing methods or through embedded potentiometric sensors into the hardened cementitious material. The potentiometric determination of chloride in cement paste pore solutions is limited by hydroxide ion interference, due to the high alkalinity of such media. The potentiometric selectivity coefficients, kcl ,OH , are determined for a chloride ionic selective electrode in alkaline solutions simulating the electrolyte present within the pore network of cement paste and concrete. This is done using a fixed interference methodology, with least-squares non-linear curve fitting for obtaining the selectivity coefficients together with other relevant electrode parameters. The limit of detection of the Cl- ISE, due to OH- interference, varies with pH. For the pore solution corresponding to an ordinary Portland cement paste or concrete, this limit can be set between 3 x 10-3 m, and 7 x 10-3 m, i.e., approximately below a chloride concentration value of 1 x 10-2 molal. Taking into account these limits of detection the free Cl- concentrations able to depassivate the steel, can be adequately determined by potentiometric measurements with calibrated ISEs in the expressed pore solutions of Portland cement concretes, without significant influence of OH- interference. Nevertheless, this effect can prevent the adequate measurement of low free Cl- concentrations, below the corresponding limit of detection value.

Revue / Journal Title

Journal of electroanalytical chemistry    ISSN  1572-6657 

Source / Source

2010, vol. 639, no1-2, pp. 43-49 [7 page(s) (article)] (36 ref.)

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Kidlington, ROYAUME-UNI  (1992) (Revue)

Mots-clés anglais / English Keywords

Electrochemical detector

;

Hydroxides

;

Interference

;

Concrete

;

Electrolyte solution

;

Potentiometry

;

Cement paste

;

Basic solution

;

Ion selective electrode

;

Chlorides

;

Selectivity

;

Determination

;

Mots-clés français / French Keywords

Détecteur électrochimique

;

Hydroxyde

;

Interférence

;

Béton

;

Solution électrolyte

;

Potentiométrie

;

Pâte ciment

;

Solution basique

;

Electrode spécifique

;

Chlorure

;

Sélectivité

;

Détermination

;

Mots-clés espagnols / Spanish Keywords

Detector electroquímico

;

Hidróxido

;

Interferencia

;

Hormigón

;

Solución electrólito

;

Potenciometría

;

Pasta cemento

;

Solución básica

;

Electrodo específico

;

Cloruro

;

Selectividad

;

Determinación

;

Mots-clés d'auteur / Author Keywords

Potentiometry

;

Ionic selective electrode

;

Sensor

;

Selectivity coefficient

;

Chloride

;

Cement paste pore solution

;

Localisation / Location

INIST-CNRS, Cote INIST : 1150, 35400018095464.0070

Nº notice refdoc (ud4) : 22393403



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