Introduction

In recent years a large number of hydrocarbon-contaminated sites has been discovered. As a consequence, microbial clean-up technologies have been developed. It has been shown, however, that the restoration of sites contaminated with lubricating oils or other complex mixtures is very complicated [1]. The biodégradation of the substances is often limited to secondary formation of alcohols and acids. There is little information about the interaction of polar substances with soils that have a low carbon content, although the importance of mineral soil components as adsorbents of organic chemicals is now generally accepted [2, 3]. The aim of the paper is to describe changes of surface characteristics of mineral adsorbents especially of the density of charge by adsorption of polar aromatic degradation products.

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