. . . . . . . . "Concentration of soluble ammonium {soluble_NH4+ CAS 14798-03-9} per unit volume of the atmosphere [aerosol <1um phase] by filtration, water leaching"@en . "SDN:P01::AEC021CC" . "accepted"@en . . "The amount (mass or moles) of the specified chemical entity contained in aerosols within the specified size fraction isolated from a volume of atmosphere using the specified method."@en . . . . "NH4+_aerosol_H2O_Leaching_<1um" . . . . . . . . . . .