"Concentration of soluble nickel {soluble_Ni CAS 7440-02-0} per unit volume of the atmosphere [aerosol >1um phase] by filtration, leaching with pH 4.7 ammonium acetate buffer"@en . . "SDN:P01::AEC014CC" . "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 . .