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Topsoil samples taken from different areas of a disused experimental coking plant were analysed in order to determine their polycyclic aromatic hydrocarbon (PAH) concentration. The variation in concentrations as a function of distance from the coking oven battery was studied and a reduction in PAH concentration as the distance to the coking ovens battery increases was observed. Two exceptions are the area in the vicinity of the tar distillation section of the plant, with a strong contribution from high temperature tar, and the area where hot coke was taken out of the ovens, with lower concentrations than expected, as a consequence of the significant presence of coke in the soil. Isomer ratios were calculated, indicating that coal is the source of the PAHs in the soil, but also suggesting an influence of transportation fuels. A comparison of the A horizon samples evidences PAH leaching.

This paper describes the evaluation of petrographic textures representing the structural organization of the organic matter derived from coal and petroleum and their interaction phenomena in the making of steel electrodes, anodes and cathode blocks.

RESUMENEn el presente trabajo se estudia por técnicas petrográficas y mediante ensayos de pirólisis o técnicas geoquímicas la serie marina del borde Oeste de la Playa de Peñarrubia (Asturias) para conocer la naturaleza de su parte orgánica.Las observaciones microscópicas en luz blanca y por fluorescencia han permitido establecer una clasificación general de la materia orgánica dispersa, su distribución y concentración a lo largo de toda la serie y según las diferentes litologías.Se han clasificado los componentes orgánicos en 9 grupos mayoritarios que se concentran, principalmente en los niveles margosos y lutíticos del Pliensbachiense, habiéndose delimitado niveles bituminosos en la parte superior de la serie. Estos están constituidos por un kerógeno de tipo 11 mixto formado por un material autóctono derivado del zooplancton y fitoplancton con escasos aportes de origen continental.El rango de la MOD ha sido determinado por reflectividad de la huminita y Rock-Eval (Tmax).La materia orgánica está en estadio inmaduro, antes de la ventana de generación del petróleo.Los ensayos de pirólisis han permitido obtener rendimientos en aceite observándose que los más elevados han correspondido a los niveles de mayor contenido orgánico o niveles bituminosos.La correlación entre los datos petrográficos y los de carácter geoquímico indica que existe una buena concordancia entre los mismos, habiéndose determinado que los componentes que generan principalmente el aceite por pirólisis a los SOO°C son los más hidrogenados. Estos corresponden a las algas, fibras y matriz órgano-mineral además de otras asociaciones submicroscópicas. Palabras clave: MOD, Rocas bituminosas, Rango, Pirólisis, Lías.ABSTRACT A study of the organic matter of a marine sequence of the west part from Peñarrubia Beach (Asturias) has been carried out using pyrolysis tests and petrographic and geochemical techniques.White light and fluorescence microscopic observations have permitted to establish a general classification of the disperse organic matter, its distribution and concentration along the series, and also the variation with the litology.The organic components have been classified into nine groups which are mainly found in the Upper part of the Pliensbachian marlaceous and lutitic beds. These bituminous leveis are composed of a kerogen type 11 or mixed, with a small contribution of terrestrial humic materials.The rank of DOM has been determined by huminite reflectance and Rock-Eval (Tmax), being both results concordant. The DOM is in an inmature stage before the oil generation window.The highest oil yields determined by pyrolysis tests at SOO°C correspond to the richest DOM levels.Petrographic and geochemical data show a good correlation. AIgae, fibers, organic-mineral matrix and other submicroscopic associations are the main source for oil generation.