0.000024
kg PO4-eq/m³
0.000024
kg PO4-eq
4
2
64.6
%
35.4
%
0.000024
kg PO4-eq/m³
0.000024
kg PO4-eq
4
2
64.6
%
35.4
%
The Eutrophication Potential (EP) Calculator estimates the nutrient loading potential of water in phosphate equivalents. Eutrophication is the enrichment of water bodies with nutrients (primarily nitrogen and phosphorus) that stimulates excessive plant and algal growth, leading to oxygen depletion and ecosystem degradation.
This calculator converts total phosphorus and total nitrogen to their PO4 equivalents using standard characterization factors from life cycle assessment methodology. It also determines the N:P ratio to identify the likely limiting nutrient, which is critical for eutrophication management strategies.
Eutrophication potential is calculated in PO4 equivalents:
EP = (TP × 3.06) + (TN × 0.42)
Where:
The N:P ratio determines the limiting nutrient: above 16 suggests P-limitation (Redfield ratio), below 10 suggests N-limitation, and 10-16 suggests co-limitation.
Inputs
Results
EP = (5 x 3.06) + (20 x 0.42) = 15.3 + 8.4 = 23.7 PO4-eq. The N:P ratio of 4 suggests nitrogen limitation.
Inputs
Results
High EP of 66.9 indicates strong eutrophication potential. The low N:P ratio of 3.3 indicates nitrogen limitation.
Eutrophication is the excessive enrichment of water bodies with nutrients, particularly phosphorus and nitrogen. This stimulates algal blooms that block light, deplete oxygen when they decompose, and can produce toxins. It degrades water quality, kills fish, and disrupts aquatic ecosystems.
The Redfield ratio (N:P = 16:1 by atoms, approximately 7:1 by mass) describes the optimal nutrient ratio for phytoplankton growth. When N:P exceeds 16 (by mass), phosphorus is limiting; when below 10, nitrogen is limiting. Management strategies should target the limiting nutrient for maximum eutrophication reduction.
The factors 3.06 for phosphorus and 0.42 for nitrogen convert nutrient masses to their phosphate equivalent potential to cause algal growth. They are based on stoichiometric relationships between nutrient uptake and algal biomass production, standardized in life cycle impact assessment methodology (CML 2001).
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