ISO 5787:1979

Specifies procedures for determining the acidity , the residue on evaporation and the water content by the Karl Fischer method. The acidity test is applicable to products having acidities, expressed as hydrochloric acid, between 1 and 50 mg/kg. For determination of ressidue on evaporation the method specified in ISO 2210 is recommended which is applicable to products leaving a residue on evaporation equal to or greater than 5 mg/kg. The method for determination of water content is applicable to products having water contents between 5 and 200 mg/kg.