Article: Research on environmental engineering described by scientists at Hohai University.

"Long-term behavior of sediment bound nitrogen (N) in promoting eutrophication of freshwater lakes can be more efficiently evaluated on the basis of different N-forms rather than on the total nitrogen (TN) content alone, these different N-forms include N in ion-extractable form (IEF-N), carbonate form (CF-N), iron-manganese oxides form (IMOF-N), and N bound in organic matter-sulfide (OSF-N). To assess the N contamination in sediment and its risk to aquatic systems, content and vertical distributions of TN and extractable nitrogen (Ex-N) in sediments from three typical shallow urban lakes in China were studied," scientists in Nanjing, People's Republic of China report.

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