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by: Matteo Hilpert


Matteo Hilpert
GPA 3.65

William Fish

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About this Document

William Fish
Class Notes
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This 1 page Class Notes was uploaded by Matteo Hilpert on Tuesday September 1, 2015. The Class Notes belongs to ESR 410 at Portland State University taught by William Fish in Fall. Since its upload, it has received 47 views. For similar materials see /class/168218/esr-410-portland-state-university in Environmental Science at Portland State University.

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Date Created: 09/01/15
Aquatic Chemistry CEESR 410510 A Few Facts about Phosphorus in Natural Waters In streams phosphorus occurs primarily as phosphate and can be either dissolved incorporated in organisms or attached to particles in the water or in bottom sediments Total phosphorus refers to the sum of all forms of phosphorus in a water sample and is reported in terms of elemental phosphorus Phosphorus is a particularly important nutrient in freshwater ecosystems because as discussed above in the nitrate section phosphorus usually is the nutrient in shortest supply and its availability often controls the rate of eutrophication When human activities make phosphorus available in larger quantities the accelerated growth of algae and other aquatic plants in streams can cause eutrophication which depletes dissolved oxygen imparts undesirable tastes and odors in the water and clogs watersupply intakes To protect against eutrophication the EPA 1986 recommends an upper limit of 01 mgL as the standard for total phosphorus in streams For this article a threshold of 01 mgL and an arbitrary threshold of 05 mg L were selected for analysis of total phosphorus concentrations in streams Several characteristics of eutrophication in lakes and reservoirs such as algal biomass water clarity and dissolvedoxygen depletion rate have been found to be strongly correlated with the loading rate of total phosphorus Rast and others 1983 Sources of phosphorus are the decomposition of organic matter and inorganic phosphate minerals that are mined and incorporated in fertilizers detergents and other commodities Thus major point sources of phosphorus to streams are waste discharges from sewagetreatment and foodprocessing plants and other industrial facilities Nonpoint sources of phosphorus include agricultural and urban runoff and in certain regions the runoff and groundwater ow from areas that contain natural deposits of phosphate minerals Hem 1985


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