BS ISO 10390:2005 is an International Standard that specifies an instrumental method for the routine determination of pH using a glass electrode in a 1:5 (volume fraction) suspension of soil in water (pH in H2O), in 1 mol/l potassium chloride solution (pH in KCl) or in 0,01 mol/l calcium chloride solution (pH in CaCl2).
BS ISO 10390 is applicable to all types of air-dried soil samples,
ISO 10390:2005