Inorganic Phosphate Uptake in a Brackish Tropical Lagoon:

http://horizon.documentation.ird.fr/.../010023666.pdf

Note:

"Seston" is all the particles floating in the water.
"K" is a constant, not potassium.
1 umol PO4-P = 0.33 ppm phosphate
1 umol PO4 = 0.1 ppm phosphate