A sequential extraction to determine the distribution of phosphorus in the seawater and marine surface sediment

The most abundant form of inorganic phosphorus in the seawater and surface sediment is calcium-bound phosphorus. Relative abundances of the remaining phosphorus forms in sediment follow the order: P-Al > P-Fe > loosely bound-P and in seawater follow the order P-Fe > P-Al > loosely bound-P.