The titration of a HF, nitric acid, titanium-etching bath has been a difficult operation, but can be simplified using a two-titration system
The titration of a HF, nitric acid etching bath containing titanium has long been a problem primarily because the titanium interferes in the normal aqueous acid/base titration.
This gave rise to unacceptable errors and as the level of titanium increased then the bath could not be titrated.
However, using a 751 titrino with a 685 dosimat this problem can be overcome.
The aqueous titrant sits on top of the 751 titrino while the non aqueous titrant sits on the 685 dosimat.
With this setup there is no manual change-over of titrants for the operator to worry about.
The analysis consists two separate titrations.
The first part is an aqueous titration and the titanium is calculated.
The second titration is non aqueous and here the HF and HNO3 are determined.
Results are extremely reproducible and subsequent top-ups of HF and or HNO3 can also be calculated to tell the operator how much to add to the bath.
Vesuv software is used to collect all the data, which is subsequently exported to other statistical software packages for trend analysis.
