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Capillary Zone Electrophoresis Method for the Determination of Sulfate in Concrete

journal contribution
posted on 2023-05-16, 09:45 authored by Harakuwe, AH, Paul HaddadPaul Haddad, Thomas, R
A capillary zone electrophoresis (CZE) method for the determination of sulfate in concrete digested with concentrated nitric acid is described. An electrolyte containing 50 mmol l–1 thiocyanate, 10 mmol l–1 tris(hydroxymethyl)aminomethane, 2.5 mmol l–1 tetradecyltrimethylammonium bromide and 140 µg ml–1 nitrate at pH 9 was used to separate the sulfate in under 12 min without significant interference from the highly acidic sample matrix containing a high level of nitrate. The external standard calibration curve was linear (r2= 99.6%) between 10 and 100 µg ml–1 and the limit of dectection (3 × baseline noise) was < 4 µg ml–1. The precisions (sr) of absolute migration times and corrected peak areas were 1.7%(n= 5) and 3.6%(n= 5), respectively. The concentration of sulfate determined in one sample of concrete using CZE (0.5% m/m) was comparable to that obtained by standard gravimetric analysis (0.6% m/m).

History

Publication title

Analytical Proceedings

Volume

32

Issue

12

Pagination

493-494

ISSN

0003-2700

Department/School

School of Natural Sciences

Publisher

RSC Publishing

Place of publication

United Kingdom

Rights statement

Copyright © 1995 Royal Society of Chemistry

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the chemical sciences

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