Characterization and fractionation of phosphorus using sequential extraction from marine sediment of Jakarta Bay

Characterization and fractionation of phosphorus (P) in the marine sediment of Jakarta Bay were investigated in this study. IR spectroscopy resulted from the main peaks at the wavenumber were 900 – 1500 cm^-1 indicates the minerals, oxide, and phosphates. Physicochemical with pH (5.8-6.7), lost on ignition (11.73-16.03 %), Fe content (8.40-59.12 mg/g), Mn content (0.17-1.38 mg/g), Ca content (0.01-8.25 mg/g) and total phosphorus (8.73-994.72 µg/g). Fractionation of phosphate using sequential extraction resulted in water-soluble P (H₂O-P) of 0.27-0.76 µg/g, loosely bound-P (NH₄Cl-P) of 0.54-2.27 µg/g, exchangeable fraction-P (NaHCO₃-P) of 3.53-9.69 µg/g, P bound to Fe (NaOH-P) of 1.63-11.23 µg/g and P bound to Ca (HCl-P) of 1.20-2.21 µg/g. The linear correlation between Mn content in sediment to HCl-P fraction with R² = 0.9126 and between calcium content in sediment to HCl-P fraction with R² = 0.8476.