Abstract
Zinc-dust distillation has been used for elucidating the basic skeleton of organic compound having oxygen contaning groups such as hydroxyl, carboxyl and carbonyl gruop.In order to determine aromatic skeletons in chemical structure of peat humic acid, zinc-dust distillation was carried out at 500°C for 2 hr in a stream of hydrogen in compari-son with the results from model substances such as δ-lactone, phthalic acid, cumarin and 1, 2-naphthoquinone.Identification and semi-quantitative determination of polycyclic aromatic hydrocarbons in the reduction products from zinc-dust distillation were performed by using the gas chromatography and GC-MS techniques.The total yield of polycyclic hydrocarbons in the reduction products having anthracene, pyrene and perylene ring was 1.9 per cent based on the original peat humic acid. However, the yield of aromatic hydrocarbons containing 3 to 5 rings from peat humic acid was approx-imately equal to those from other model substances.From these results, it assumed that the peat humic acid has no polycyclic ring systems as the aromatic structure, and that the polycyclic aromatic hydrocarbons obtained from the peat humic acid by zinc-dust distillation was formed by rearrangement and condensation of oxygen containing structure under reaction conditions.
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