DETERMINATION OF C-60 AND OR C-70 CONCENTRATIONS/

Two methods of quantitative analyses of the fullerenes C-60 and C-70 a re described. Quantitative Infrared Spectroscopy permits the determina tion of the concentrations of pure and mixed compositions of C-60 and C-70 in carbondisulfide solutions. Alternatively, the ratio of C-60/C- 70 is analyzed by evaluating the lattice parameters of a solid solutio n of the fullerene species and cyclohexane according to Vegard's Law. Both methods show high accuracy and are suited for calibration of mass spectrometric analyses of fullerene samples.