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Photochemical mineralization of synthetic lignin in lake water indicates enhanced turnover of aromatic organic matter under solar radiation |
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| Authors: | Anssi V Vähätalo Kalevi Salonen Mirja Salkinoja-Salonen Annele Hatakka |
| Institution: | (1) Lammi Biological Station, University of Helsinki, FIN-16900 Lammi, Finland;(2) Department of Applied Chemistry and Microbiology, Viikki Biocenter, University of Helsinki, P.O.Box 56, FIN-00014, Finland;(3) Section of Hydrobiology and Limnology, Department of Biological and Environmental Science, University of Jyväskylä, P.O. Box 35, FIN-40351 Jyväskylä, Finland |
| Abstract: | The degradation of 14C-ring]-labelled syntheticlignin (14C-DHP) and dissolved organic carbon(DOC) from lake water were studied simultaneously.14C-DHP was incubated in humic lake water (colour173 mg Pt l-1) for 7 d in the dark or under solarradiation. In the dark <0.4% of the introduced14C-DHP label and 4% of the indigenous DOC weremineralized, indicating that the 14C-labelledaromatic rings of DHP and the humic DOC weremicrobiologically recalcitrant. Under solar radiation(116 MJ m-2), 17–21% of the 14C-labelledcarbons in DHP and 18–23% of the indigenous DOC weremineralized in 7 d. Simultaneously the watersolubility of 14C-DHP increased. Solar radiationconverted the aromatic cores of synthetic lignin toCO2 and soluble organic photoproducts. Theresults suggest that solar radiation plays a key rolein the decomposition of natural polyaromatic matter. |
| Keywords: | Carbon cycling humic matter lignin mineralization photocatalysis solar radiation |
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