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South African Journal of Chemistry

On-line version ISSN 1996-840X
Print version ISSN 0379-4350

S.Afr.j.chem. (Online) vol.64  Durban  2011




Potentiometric determination of free chloride in cement paste - An alternative method for low-budget laboratories



D.J. DelportI, *; S.S. Potgieter-VermaakII, III; R.I. McCrindleIV; J.H. PotgieterV

IDepartment of Chemical & Metallurgical Engineering, Tshwane University of Technology, Private Bag X680, Pretoria, 0001 South Africa
IIDivision of Chemistry & Environmental Science, Manchester Metropolitan University, M1 5GD, UK
IIIMolecular Science Institute, School of Chemistry, University of the Witwatersrand, Johannesburg, South Africa
IVDepartment of Chemisty, Tshwane University of Technology, Private Bag X680, Pretoria, 0001 South Africa
VChemistry and Materials Division, School of Biology, Chemistry and Health Sciences, Manchester Metropolitan University, All Saints Campus, Oxford Road, Manchester, Ml 5GD, UK




Corrosion of rebar in concrete is commonly associated with, and to a large degree influenced by, the free chloride concentration in the pore water. The amount of chloride in concrete is important because chloride can promote corrosion of steel reinforcement when moisture and oxygen are present. A potentiometric procedure that makes use of direct measurement with a chloride ion selective electrode has been developed to analyze free chloride in the pore water extracted from cement paste.16 The accuracy and reliability of this analytical technique has been checked against a certified reference material, Merck sodium chloride solution. Confidence levels (CL095), of 0.03 and relative standard deviations of 0.2 % for chloride were determined for ordinary Portland cement (OPC) chloride binding capacity.

Keywords: OPC, free chloride, potentiometry



Full text available only in pdf format.




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Received 18 February 2011
Revised 18 November 2011
Accepted 30 November 2011



Submitted by invitation to celebrate 2011 the 'International Year of Chemistry'.
* To whom correspondence should be addressed. E-mail:

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