DS EN 27627-2:1994 Hard Metals - Chemical Analysis By Flame Atomic Absorption Spectrometry - Part 2: Determination Of Calcium, Potassium, Magnesium And Sodium In Contents From 0,001 To 0,02% (M/M) Defines the method to be used for the determination of calcium, potassium, magnesium and sodium contents of hard metals within the range 0,001 to 0,02% (m/m) by flame atomic absorption spectrometry.