. . . . . . . . . . . . "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 . "SDN:P01::AEC118SD" . "soluble_Ca_aerosol_NH4AC_Leaching_>1um_SD" . . "Concentration standard deviation of soluble calcium {soluble_Ca CAS 7440-70-2} per unit volume of the atmosphere [aerosol >1um phase] by filtration, leaching with pH 4.7 ammonium acetate buffer"@en . . . . . . . . . . . .