1987 Volume 3 Issue 5 Pages 457-461
The applicability of the zone-melting technique using dibenzofuran as a medium to the separation of small amounts of anthracene in polynuclear aromatic chemicals has been studied. After 100mg (or 20mg) of the chemicals containing anthracene had been mixed with 4g of purified dibenzofuran, 20 zone-passes were performed. Most of the compounds and the concomitant impurities could be eliminated from the beginning part of the zone-molten ingot, in which anthracene is concentrated. By this technique, anthracene was separated from chemicals such as pyrene, benz [a] anthracene, 9-fluorenone, and 9, 10-phenanthrenequinone up to 100mg, and perylene and anthraquinone up to 20mg. The zone-molten ingot was cut into halves and the beginning half was dissolved in xylene. Anthracene separated in this half could be determined by synchronous fluorescence spectrometry without removal of dibenzofuran. The recovery of anthracene was 93-95%. The determination limit in the first four chemicals listed was 2ppm and in the latter two the limit was 10ppm.
