The molybdenum-blue method of determining dissolved inorganic phosphorus in sea water was modified for use with a photoelectric colorimeter. The effect of reagent concentration, time, and temperature on the rate and extent of color development was studied. Practical suggestions are given for carrying out routine analyses at sea.
Wooster, Warren S., and Norris W. Rakestraw. 1951. "The estimation Oof dissolved phosphate in sea water." Journal of Marine Research 10, (1). https://elischolar.library.yale.edu/journal_of_marine_research/738