LUMINESCENT METHOD FOR THE DETERMINATION OF TERBIUM WITH CIPROFLOXACIN Russian patent published in 2022 - IPC G01N31/00 G01N21/76 

FIELD: analytical chemistry.

SUBSTANCE: invention relates to analytical chemistry, in particular to methods for the luminescent determination of terbium, and can be used to determine trace amounts of terbium in the analysis of high-purity lanthanides. A luminescent method for the determination of terbium is proposed, including its conversion into a luminescent complex compound with an organic reagent (R), characterized in that ciprofloxacin is used as an organic reagent in the ratios Tb:R=1:2 at pH=5.8±0.1 s the lower detection limit of 5.61⋅10^–8 g/ml Tb and after sorption concentration on the AB-17 sorbent was 4.6⋅10^–9 g/ml Tb, and to obtain solutions of lanthanide chlorides, their oxides are preliminarily calcined for one hour in a muffle furnace at a temperature of 650-700°C and cooled in a desiccator, a sample of lanthanide oxides, according to the calculations of their concentrations, is treated with hydrochloric acid and H₂O₂, and then the solution is evaporated, then the dry residue of rare earth elements is dissolved in distilled water, and when irradiated with UV light, a green glow is observed terbium ion colors.

EFFECT: method allows to reduce the detection limit, increase the stability, sensitivity and selectivity of the luminescent method for the determination of terbium.

1 cl, 2 dwg, 5 tbl, 3 ex