|Average concentration in ocean:||2.0 Ámol/kg|
|Residence time:||69,000 yrs|
Dissolved P is present in seawater primarily as HPO42- and H2PO4-, which are base ions of orthophosphoric acid (H3PO4). The sum of these ions are typically called phosphate.
The phosphorus residence time is from Tracers in the Sea (Broecker, W. S. and Peng, T.-H., 1982. Eldigo Press, Palisades, NY). It was calculated from the global average river input.
Phosphate is determined colorimetrically by forming a blue colored reduced, phosphomolybdate complex.
References & Notes