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Phosphorus Mobilization from Various Sediment Pools in Response to Increased pH and Silicate Concentration

^a Dep. of Limnology and Environmental Protection, P.O. Box 27, FIN-00014 Helsinki Univ., Finland
^b Dep. of Applied Chemistry and Microbiology, P.O. Box 27, FIN-00014 Helsinki University, Finland

View larger version (35K): [in a new window]   Fig. 1. The experimental design and the laboratory procedure. Three replicates were used

View larger version (26K): [in a new window]   Fig. 2. The effect of the different treatments on the desorption of labeled 33P (A, top) and unlabeled P (B, bottom) from the NaOH fraction, and on the recovery of released P in the NH4F fraction and in the interstitial water. Values are percent units of the P amount in the NaOH fraction in the control sample without pH manipulation and Si enrichment. High Si = high Si enrichment, elevated pH + high Si = elevated pH combined with high Si enrichment