Ferroin indicator solution (CAS 14634-91-4)

Ferroin indicator solution is a colored chelate complex of 1,10-phenanthroline and ferrous ion, used primarily as a redox indicator in various analytical chemistry applications. This solution is notable for its striking color change from pale blue in oxidized form to a bright red in reduced form, making it an invaluable tool in titrations, particularly those involving the determination of iron or the measurement of chemical oxygen demand (COD) in environmental samples. The mechanism of action in Ferroin indicator solution involves the reversible interconversion between the ferrous (Fe^2+) and ferric (Fe^3+) states of iron, mediated by the surrounding ligand environment provided by the 1,10-phenanthroline. This transformation leads to a distinct color change, which is easily observable and can be precisely correlated to the concentration of oxidizing or reducing agents in a sample. In research, Ferroin indicator solution has been extensively used to study electron transfer processes and to develop new analytical methods for environmental monitoring and control. Its effectiveness in providing clear and accurate visual cues has also been leveraged in educational settings to demonstrate fundamental principles of redox chemistry, enhancing the understanding of chemical reactions and their applications in real-world scenarios.