LUMINESCENT METHOD FOR THE DETERMINATION OF TERBIUM WITH NOLICIN Russian patent published in 2023 - IPC G01N31/00 G01N21/76 

FIELD: analytical chemistry.

SUBSTANCE: methods for the luminescent determination of terbium. The method includes the conversion of terbium into a luminescent complex compound with organic reagent (R) nolicin in ratios Tb:R=1:1 at pH=5.9±0.1, the luminescence intensity of the complexes at λ=545 nm. The lower limit of detection of terbium with nolicin after sorption concentration on the AB-17 sorbent is 4.7⋅10^–9 g/ml of Tb. In this case, the determination of terbium is carried out from solutions of lanthanide chlorides. To obtain lanthanide chlorides, lanthanide oxides are preliminarily calcined for one hour in a muffle furnace at a temperature of 650-700°C and cooled in a desiccator. Next, a portion of lanthanide oxides, according to the calculations of their concentrations, is treated with hydrochloric acid and H₂O₂. Then the solution is evaporated, then, the dry residue of rare earth elements is dissolved in distilled water.

EFFECT: reduction of the detection limit, increasing the stability, sensitivity and selectivity of the luminescent method for the determination of terbium.

1 cl, 2 dwg, 1 tbl, 3 ex