Abstract
Four milled peat samples from three Finnish peatlands were studied in terms of their extract content and composition of fatty compounds and sterols using capillary g.c.-m.s. The extract yields obtained by CH 2Cl 2-acetone (9:1 v/v) ranged from 49 to 180 mg g −1 of dry peat. The wax content of peat extracts varied between 43 and 55 wt %. The acidic part of extracts contained mainly long-chain fatty acids and ω-hydroxy acids with some α,ω-alkanedioic acids. The neutral extractives included predominantly primary alkanols with smaller amounts of n-alkanes and sterols. The extracts of all four peat samples were qualitatively similar but the milled peat Al with high heat value (27.1 MJ kg −1) differed from the other peats in extract content and composition. The peat B with enhanced self-heating ability resembled the ordinary milled peats A2 and C in peat technological characteristics and extractive composition. Accordingly, the self-heating ability of milled peat in stockpiles does not correlate directly to the distribution pattern of long-chain fatty compounds and sterols.
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