"Uptake rate of phosphate {PO43- CAS 14265-44-2} per hour per unit volume of the water body [particulate >0.2um phase] by isotope-labelled tracer addition, antibiotic poisoning, incubation in the dark, cascade filtration and counting residue and summation of size-fractionated values"@en . . "SDN:P01::NPUPRYP4" . "Measurements made by radiotracer and antibiotic doped incubation in the dark followed by counting particulates collected on each filter of a filter cascade down to a 0.2um pore filter. Rate normalised by dividing the total uptake by the incubation duration in hours and size-fractionated values summed to give the total."@en . .