Abstract
The degradation of 14C-[ring]-labelled synthetic lignin (14C-DHP) and dissolved organic carbon (DOC) from lake water were studied simultaneously. 14C-DHP was incubated in humic lake water (colour 173 mg Pt 1(-1)) for 7 d in the dark or under solar radiation. In the dark <0.4% of the introduced 14C-DHP label and 4% of the indigenous DOC were mineralized, indicating that the 14C-labelled aromatic rings of DHP and the humic DOC were microbiologically recalcitrant. Under solar radiation (116 MJ m(-2)), 17-21% of the 14C-labelled carbons in DHP and 18-23% of the indigenous DOC were mineralized in 7 d. Simultaneously the water solubility of 14C-DHP increased. Solar radiation converted the aromatic cores of synthetic lignin to CO2 and soluble organic photoproducts. The results suggest that solar radiation plays a key role in the decomposition of natural polyaromatic matter.
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