Titer standardisation of the titration solution

The titer of the solution is determined in use on a daily basis. To do so, 10.0 ml of the potassium dichromate solution 0.02 mol/l are diluted with water to approx. 100 ml. 30 ml of sulphuric acid are added carefully to this solution. After cooling down the solution is placed on the magnetic stirrer and titrated using 3 times the method ?Titer COD“. A triple determination is carried out. The average value is automatically calculated in mol/l and stored into the exchange unit.