Content Handbook H
Outline of method
The sample is dissolved in a known amount of EDTA solution in excess. The excess is titrated with standard magnesium sulphate, using Mordant black 11 as indicator, to determine total metals.
Potassium cyanide is added and the solution is titrated again with magnesium sulphate to determine the zinc. The manganese is determined from the difference of the titres.
The method is usable for TC, WP,WG, SC and DP-formulations.