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NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2016, 7 (1), P. 104–110

Approaches to the determination of C60 and C70 fullerene and their mixtures in aqueous and organic solutions

I.V. Mikheev – Chemistry Department, Lomonosov Moscow State University; Agilent Technologies Authorized Partner Laboratory / Analytical Centre of Lomonosov Moscow State University Moscow 119991, Russia; mikheev.ivan@gmail.com
T. A. Bolotnik – Chemistry Department, Lomonosov Moscow State University; Agilent Technologies Authorized Partner Laboratory / Analytical Centre of Lomonosov Moscow State University Moscow 119991, Russia; timab@tut.by
D. S. Volkov – Chemistry Department, Lomonosov Moscow State University; Agilent Technologies Authorized Partner Laboratory / Analytical Centre of Lomonosov Moscow State University Moscow 119991, Russia; dmsvolkov@gmail.com
M.V. Korobov – Chemistry Department, Lomonosov Moscow State University, Moscow 119991, Russia; mkorobov49@gmail.com
M. A. Proskurnin – Chemistry Department, Lomonosov Moscow State University; Agilent Technologies Authorized Partner Laboratory / Analytical Centre of Lomonosov Moscow State University Moscow 119991, Russia; proskurnin@gmail.com
Chemistry Department, Lomonosov Moscow State University; Agilent Technologies Authorized Partner Laboratory / Analytical Centre of Lomonosov Moscow State University Moscow 119991, Russia

The solvent-exchange process from toluene was used for preparing aqueous dispersions of C60 and C70 without preconcentration with final concentrations of 180 ± 2 and 62 ± 1 μM, respectively, which exceeds the previously reported maximum concentrations for C60 more than 6-fold; for C70 such an aqueous dispersion is prepared for the first time. The residual quantity of the organic solvent and low-molecular compounds determined by headspace GC-MS was not more than 1 ppb. The procedure for the determination of fullerenes in aqueous dispersions is developed using a total organic carbon analyzer and absorption spectra; LOD, 50 nM, LOQ, 200 nM by TOC. Spectrophotometric determination of fullerenes in their aqueous dispersions was optimized: for C60 at 268 nm:
LOD, 0.1 μM, LOQ, 0.3 μM, for C70 at 218 nm: LOD, 0.1 μM, LOQ, 0.3 μM. RSD mixture quantification by Vierordt’s method in the range of 2 – 20 μM does not exceed 0.14 for C60 and 0.09 C70. RSD for toluene fullerene mixtures by Vierordt’s method in the range of 2 – 20 μM does not exceed 0.10 for C60 and 0.06 for C70.

Keywords: fullerene C60, fullerene C70, fullerene mixture, UV/vis. fpectroscopy, GC/MS.

PACS 78.40.Ri, 82.70.Gg

DOI 10.17586/2220-8054-2016-7-1-104-110

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