Concentration standard deviation of ammonium {NH4+ CAS 14798-03-9} per unit volume of the water body [dissolved plus reactive particulate phase] by colorimetric autoanalysis D+RNH4_SD The square root of the average of the squares of deviations about the mean of a set of values of the specified measurement. 2018-10-15 17:05:31.0 SDN:P01::SDAMAATX SDN:P01::SDAMAATX SDN:P01::SDAMAATX 5 5 2018-10-15 17:05:31.0 accepted false