DIN EN 13466-1:2002-01

The document specifies a titrimetric method for the determination of water content of fertilizers based on the use of a Karl Fischer reagent. The method is applicable to all solid mineral fertilizers. The result (KFM water) encompasses 'free' water and some of the constitution, ie. crystal water, and is considered as valid, if within 0,1 % to 5 % (by mass) of the material tested. Metal oxides and hydroxides soluble in methanol and pyridine will have an effect which may be corrected for, if their content is known.