Classification^a

(proposed by (Haygarth & Sharpley, 2000) )

Equivalent terms employed in literature^b

TP (unf)

Total P from an unfiltered sample

TP (>0.45 µm)

Particulate P, sediment-bound P, suspended P

TP (<0.45 µm)

Total dissolved P

RP (unf)

Total reactive P

RP (<0.45 µm)

Molydate-reactive P, dissolved reactive P, soluble reactive P, dissolved molydate reactive P, orthophosphate, inorganic P, phosphate

RP (>0.45 µm)

Molybdate-reactive particulate P, particulate reactive P

UP (unf)

Total organic P

UP (<0.45 µm)

Dissolved organic P, soluble organic P, dissolved nonreactive P

UP (>0.45 µm)

Particulate organic P