. . . . . . . . . . . . . . "Concentration standard deviation of ammonium {NH4+ CAS 14798-03-9} per unit volume of the atmosphere [aerosol >1um phase]"@en . . "The square root of the average of the squares of deviations about the mean of a set of values of the specified measurement."@en . . "NH4+_aerosol_>1um_SD" . "SDN:P01::CAM88218" . . "accepted"@en . . . . . . . . .