Isotopic concentrations of lithium have been determined by emission spectrometry using an optical scanning method. Results indicate that the method provides results with a precision of 1%, relative standard deviation.
F. E. Lichte and R. K. Skogerboe, "Emission Spectrometric Determination of Isotopic Concentrations of Lithium," Appl. Spectrosc. 28, 354-355 (1974)