Multiple sources of alkylphenols produced upon pyrolysis of DOM, POM and recent sediments

This study focuses on the different precursors of simple alkylphenols in py rolyzates of different types of organic matter. Several organic matter samp les were studied, i.e. dissolved organic matter (DOM), particulate organic matter (POM), sediments, polysaccharide/protein standards, algae, hydrolyza ble tannins, lignins, lignites, coals, soils and insect cuticles. Most samp les were subjected to saponification and some to hydrolysis using hydrochlo ric acid. Distribution patterns of the alkylphenols in the pyrolyzates were compared with those in pyrolyzates of natural samples. To some extent, the distribution patterns of these alkylphenols can be used to discriminate th eir precursors, lignins, protein and transformed protein. Alkylphenols in p yrolyzates of samples like DOM, POM and sediments are probably reflecting p olymers which are formed by cross-linking of protein units (tyrosine) formi ng non-amide bonds on hydrolysis of polysaccharide/protein material in the water column. The polysaccharide part plays a major role in the formation o f these polymers. (C) 1999 Elsevier Science B.V. All rights reserved.