Also related to the "Redfield Racio", I link below a link of a recent review (2014) on the concentrations of carbon, nitrate and phosphate in the oceans and plankton, published in Nature, with direct reference to the work of Redfield:
Concentrations and ratios of particulate organic carbon, nitrogen, and phosphorus in the global ocean
Regards
Concentrations and ratios of particulate organic carbon, nitrogen, and phosphorus in the global ocean
Regards