Maybe one of the Titrando models by metrohm. There are different models for different purposes and in different price ranges but they're very precise for automated titrations. GRAN-calculations (via VBA code, titriSoft is included) have to be performed in Excel but can be automated by macros. Results can be fed back to the Titrando system for database-storage and other applications. Take a look at them here:

https://www.metrohm.com/en-gb/products-overview/titration/titrando/product-filter/#

Dear Sir. Concerning your issue about titration system to analyze seawater alkalinity using potentiometric Gran titrations . I think the following below links and the attached file may help you in your analysis:

http://cdiac.ess-dive.lbl.gov/ftp/cdiac74/sop03.pdf

http://archimer.ifremer.fr/doc/00120/23155/21000.pdf

Thanks

Thanks!

Has anyone had any experience with Hach's Titralab AT1000?

It is relatively cheap and looks alright