LUMINESCENT METHOD OF DETERMINING EUROPIUM WITH OFLOXACIN Russian patent published in 2025 - IPC G01N21/64 C09K11/06 C09K11/77 C01F17/10 C07F15/00 

FIELD: chemistry.

SUBSTANCE: invention relates to analytical chemistry and can be used to determine trace amounts of europium when analysing high-purity lanthanides. Europium oxide pre-calcined for one hour in a muffle furnace at temperature of 650–700 °C is cooled in a desiccator. Weighed portion of oxide according to calculations of its concentration of 10⁻³–10^–5 M is treated with hydrochloric acid and H₂O_2. Obtained solution is evaporated. Dry residue is dissolved in water. Organic reagent R is added to the obtained solution, which contains ofloxacin (OF), with molar ratio Eu:R = 2:3 and pH = 9.8 ± 0.1. Solution containing the formed luminescent complex of europium is then irradiated with UV light at λ = 614 nm and a red luminescence characteristic of europium ions is observed. Lower limit of detection of europium in a complex with OF is 7.5⋅10⁻⁷ g/ml Eu.

EFFECT: method provides high selectivity and sensitivity.

2 cl, 2 dwg, 4 tbl, 3 ex