"Uptake rate of ammonium {NH4+ CAS 14798-03-9} per day per unit volume of the water body [particulate GF/F-5um phase] by isotope-labelled tracer addition, incubation at unspecified light level, cascade filtration and mass spectrometry on residue"@en . . "SDN:P01::SAUPIIPM" . "Measurements made by isotope-doped incubation experiment followed by mass spectrometric analysis of particulates collected on a GF/F filter filtering water previously filtered through a 5um pore filter. Incubation conditions not specified by parameter code."@en . .