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The seasonal change in phosphorus dissolution in Lake Biwa sediments

Summary Sediment diffusion chambers were used to detect enhanced dissolution of phosphorus when the sediments of Lake Biwa became more reduced. A minor decrease in the mean Eh potential from +85 mV in June to -9 mV in October resulted in several samples having 3.8 times more phosphorus (relative to iron) than observed in the June porewater. The dissolution of vivianite appears to account for the higher concentrations of phosphorus in sediment porewaters.