particulate phosphorus

(referred to also as Total Suspended Phosphorus)
Phosphorus fraction that is adsorbed or absorbed on soil or sediment particles, and maybe comprised of both organic and mineral forms. This fraction is usually quantified by subtracting TDP from TP. Alternatively, this fraction can be measured by subjecting the particulates collected on 0.45 µm* to a rigid digestion procedure and analyzing the digestate for P (APHA, 1989).