. . . . . . . . . . . "The square root of the average of the squares of deviations about the mean of a set of values of the specified measurement."@en . "SDN:P01::CSO88213" . . "accepted"@en . . . . "Concentration standard deviation of soluble copper {soluble_Cu CAS 7440-50-8} per unit volume of the atmosphere [aerosol >1um phase]"@en . . "soluble_Cu_aerosol_>1um_SD" . . . . . . .