The origin of the problem. Iron, one of the most common metals in the environment, plays a key role in many biological and biogeochemical processes, which determines its presence in various oxidation states. The relevance of iron in environmental and industrial chemistry, human physiology, and many other fields has necessitated the development and optimization of precise analytical methods for determination. In the analytical determination of iron in real samples, spectrophotometric and absorption-spectroscopic methods are most frequently used.
Objective of the work: To develop fast, selective, and sensitive sorption-spectroscopic methods for the determination of iron ions using immobilized reagents.
Methodology. Sorption-spectrophotometric hybrid methods were applied. Optimal conditions for immobilization and complex formation were studied depending on time, environment, temperature, and other factors.
Scientific novelty. A sorption-spectrophotometric method has been developed for determining the micronumber of iron ions using immobilized methyltimol blue in the analysis of natural surface waters.
Results obtained. An accelerated method for sorption-spectroscopic determination of iron ions in natural wastewater has been developed using immobilized methyltimol blue and improved metrological indicators. Conditions for the immobilization, complexation, and detection of iron ions have been optimized. It has been established that the optimal buffer at pH 2.5 is a universal buffer solution. The developed method was used in the analysis of drinking water with a determination limit of 0.1 μg/l.