Chuck Hansen 3.7.13.  Dissolved Inorganic Phosphorus (DIP) aka Soluble Reactive Phosphorus (SRP)  Disolved Organic Phosphorus (DOP)  Particulate Phosphorus.

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Presentation transcript:

Chuck Hansen

 Dissolved Inorganic Phosphorus (DIP) aka Soluble Reactive Phosphorus (SRP)  Disolved Organic Phosphorus (DOP)  Particulate Phosphorus (PP)  Total P = DIP + DOP + PP  Found in the form of Phosphates (PO 4 -3 )  Important to plants, animals, and microbiota  Growth – Limiting Nutrient

 Weathering of Apatite  Point Sources  Sewage, Urban Runoff  Nonpoint Sources  Agriculture, Animal Waste, Fertilizers  Modes of Entry to Aquatic Systems  Precipitation (dust in air), Groundwater Adsorption, Surface Runoff

 Decreases Downstream  Can occur faster than needed for growth  Rate of uptake dependant upon how much organic matter there is to take it in, and the metabolism of those constituents

 How does the solubility of Fe influence the phosphorus redox reactions? As a result, explain how sulfur and iron trapping influences the concentration of phosphorus in the hypolimnion at overturn in a lake.  Others….

 Iron trap for P  - In oxygenated waters, iron is present as Fe 3+ (ferric)  pH < 7 : Fe 3+ + PO 4 3- : FePO 4 (Vivianite)  pH > 7 : Fe 3+ + PO OH- : Fe 2, OH, PO 4

 Fe 3+ conversion to Fe 2+ releases PO 4 3-  Sulfur trap may lower iron concentrations enough to allow some phosphate to remain at overturn  All these reactions mediated by bacteria

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