Determination of isotopic ratio of boron in boric acid solutions by ATR–FTIR spectroscopy

Grégory Lefèvre (1)

1 IRCP - Institut de Recherche de Chimie Paris

Due to the low atomic mass of boron, its different isotopes (B-10 and B-11) leads to a measurable impact on vibrational spectra. Indeed, a shift in the asymmetric stretching of the dissolved species has been found using attenuated total reflectance infrared spectroscopy, and those of acid species is higher than those of the borate ion (41 cm-1 vs. 20 cm-1 , respectively). A calibration from pure B-10 to pure B-11 boric acid has been performed, leading to an accuracy higher than 0.5% on the B-10 percentage of 0.1 M solution of mixtures of the two isotopes. Article Highlights-The isotope of boron has an impact on the infrared spectra of solutions-A difference of 14 cm-1 has been found using attenuated total reflectance infrared spectroscopy-The isotopic ratio of boron in boric acid can be measured after a calibration step

Mots clés: Boron isotopes; Solution analysis by infrared spectroscopy; Enriched boric acid

Domaines: Chimie analytique; Chimie inorganique

Grégory Lefèvre. Determination of isotopic ratio of boron in boric acid solutions by ATR–FTIR spectroscopy. Journal of Radioanalytical and Nuclear Chemistry, In press, ⟨10.1007/s10967-022-08746-8⟩. ⟨hal-03933000⟩