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By using instrumental neutron activation analysis (INAA) it has been shown that commercial C 60 products contain considerable amounts of sulfur impurity. This element could be found in all C 60 samples of three main producers which, in fact, necessitated to study the capabilities of the INAA sulfur determination in more detail. Although only one sample did contain a surprisingly high sulfur amount of about 8%, even the sublimed C 60 sample showed a sulfur content of about 0.02%.

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