"Uptake rate of ammonium {NH4+ CAS 14798-03-9} per day per unit area of the water body [particulate >GF/F phase] by isotope-labelled tracer addition, incubation at different light levels, filtration and mass spectrometry on residue and profile integration"@en . . "SDN:P01::INAUIIP1" . "Depth integration of a set of measurements made by isotope-doped incubation experimentsfollowed by mass-spectrometric analysis of particulates collected on a GF/F filter."@en . .