Abstract
All anthropogenic organic chemicals form non-extractable residues to some extent when entering soils. This well-known phenomenon has been studied for many years especially in the field of soil agrochemistry. Similar processes have been observed during the bioremediation of oil-contaminated soils (see table 16.3) and the residue formation of toxic and carcinogenic polycyclic aromatic hydrocarbons is of particular concern. Apart from mineralisation, the formation of non-extractable residues is certainly the major sink of anthropogenic pollutants in soils. However, macromolecular non-extractable xenobiotic residues are difficult to examine by conventional analytical techniques. Therefore, formation, structure and significance of these macromolecular residues in the environment are still unknown today.
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