Abstract
In the season of blooming, dissolved phosphorus and some environmental factors were measured for seawater in Hiroshima Bay at about one-week interval. The concentrations of dissolved phosphorus with some chemical forms were determined by a combination of photo-oxidation, wet-oxidation and acid-hydrolysis. Their concentrations were discussed in connection with AOU (apparent oxygen utilization). From these analyses, it was demonstrated that OMP (organic monophosphate) was excreted from living phytoplankton. It was also found that concentrations of CF (condensed phosphate) plus OPP (organic polyphosphate) were much lower than those of OP (orthophosphate) and OMP. CP plus OPP may be stable residue of DOP or may be present in bacterial cells.
