"Uptake rate of ammonium {NH4+ CAS 14798-03-9} per day per unit volume of the water body [particulate 2-20um phase] by isotope-labelled tracer addition, incubation at unspecified light level, cascade filtration and mass spectrometry on residue"@en . . "SDN:P01::SAUPIIPG" . "Measurements made by isotope-doped incubation experiment followed by mass spectrometric analysis of particulates collected on a 2um pore filter filtering water previously filtered through a 20um pore filter. Incubation conditions not specified by parameter code."@en . .