. . "The square root of the average of the squares of deviations about the mean of a set of values of the specified measurement."@en . . "accepted"@en . . . "Concentration standard deviation of soluble ammonium {soluble_NH4+ CAS 14798-03-9} per unit volume of the atmosphere [aerosol <1um phase] by filtration, leaching with pH 4.7 ammonium acetate buffer"@en . "NH4+_aerosol_NH4AC_Leaching_<1um_SD" . . "SDN:P01::AEC057SD" . . . . . . . . . . . . . . . . . . . .