Detection and quantitative determination of chlorine on the surfaces of construction materials

Abstract

The study presents the results of an investigation into the possibilities of quantitative analysis using the MALDI method. An important practical problem was considered in relation to the detection and determi-nation of chlorine on the surfaces of aluminium structural materials after atmospheric corrosion. It was found that chlorine detection by chloride ions is possible only up to 10^-12 mol/mm², which hardly meets practical requirements. It was shown that the analytical characteristics in the determination of chlorine can be signifi-cantly improved by derivatizing the surface with silver nitrate. The resulting cluster ions reduce the sensitivi-ty limit to 10^-18 mol/mm² and expand the dynamic range to three orders of magnitude in concentration. It was also shown that the method can be extended to detect other halogens on various surfaces. The method can be applied in various fields of science and industry. For example, the method can be used in the search for chlo-rine on the surface of various structural materials, for the determination of local chlorine concentrations at a specific point, for plotting chlorine distribution diagrams over the surfaces of various structural materials, for studying the kinetics of chlorine sorption in experiments on atmospheric corrosion, and also for the search for impairments of surface morphology based on the distribution of adsorbed chlorine on the surface