Analysis of total- and water-soluble chloride in concrete using an optical sensor.

IF 5.6 1区化学 Q1 CHEMISTRY, ANALYTICAL

Talanta Pub Date : 2025-10-01 Epub Date: 2025-04-11 DOI:10.1016/j.talanta.2025.128124

Karl L Sterz, Bernhard Müller, Marlene Sakoparnig, Isabel Galan, Andreas Steinegger, Cyrill Grengg, Florian Mittermayr, Sergey M Borisov, Torsten Mayr

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引用次数: 0

Abstract

An optical chloride-sensitive film was prepared and utilized to measure the chloride content in powdered concrete samples. The sensor is composed of N,N'-dimethyl-9,9'-biacridiniumnitrat (Lucigenin), a phosphorescent ruthenium complex in dense silica microparticles and a custom-made poly(acrylonitrile-co-acrylamide) matrix, allowing utilization of the dual lifetime referencing (DLR) technique. No dependency on pH value was observed at pH values from 1.0 to 7.0. Among the relevant anions, the sensor did not show any cross-talk to sulphate, but the response towards chloride was reduced in presence of nitrate and acetate ions. The sensor remains stable in water and 50 % acetic acid, which enables measurements of water-soluble chloride and total chloride. The sensor was challenged with concrete samples of various origins and with strong differences in chloride contamination (0.02-0.38 %w/w). The results of the optical measurements are in excellent agreement with results obtained from potentiometric titrations. The divergent binder chemistry of the selected concrete samples and the reliability of the measured results suggest wide applicability of the sensor. The sensor also shows potential to be suitable for field measurements.

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用光学传感器分析混凝土中总氯和水溶性氯。

制备了一种光学氯化物敏感膜，用于测定粉状混凝土样品中的氯化物含量。该传感器由N，N'-二甲基-9,9'-biacridiniumnitrat （Lucigenin）、密集二氧化硅微粒中的磷光钌配合物和定制的聚（丙烯腈-共丙烯酰胺）基质组成，允许使用双寿命参考（DLR）技术。在1.0 ~ 7.0的pH值范围内，对pH值没有影响。在相关阴离子中，传感器对硫酸盐没有任何串扰，但对氯化物的响应在硝酸盐和乙酸离子存在下降低。该传感器在水中和50%的醋酸中保持稳定，可以测量水溶性氯化物和总氯化物。传感器受到不同来源的混凝土样品的挑战，氯化物污染差异很大（0.02- 0.38% w/w）。光学测量的结果与电位滴定的结果非常吻合。所选混凝土样品的不同粘结剂化学性质和测量结果的可靠性表明该传感器具有广泛的适用性。该传感器也显示出适用于现场测量的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Talanta 化学-分析化学

CiteScore

12.30

自引率

4.90%

发文量

861

审稿时长

29 days

期刊介绍： Talanta provides a forum for the publication of original research papers, short communications, and critical reviews in all branches of pure and applied analytical chemistry. Papers are evaluated based on established guidelines, including the fundamental nature of the study, scientific novelty, substantial improvement or advantage over existing technology or methods, and demonstrated analytical applicability. Original research papers on fundamental studies, and on novel sensor and instrumentation developments, are encouraged. Novel or improved applications in areas such as clinical and biological chemistry, environmental analysis, geochemistry, materials science and engineering, and analytical platforms for omics development are welcome. Analytical performance of methods should be determined, including interference and matrix effects, and methods should be validated by comparison with a standard method, or analysis of a certified reference material. Simple spiking recoveries may not be sufficient. The developed method should especially comprise information on selectivity, sensitivity, detection limits, accuracy, and reliability. However, applying official validation or robustness studies to a routine method or technique does not necessarily constitute novelty. Proper statistical treatment of the data should be provided. Relevant literature should be cited, including related publications by the authors, and authors should discuss how their proposed methodology compares with previously reported methods.