dTPA 99% CAS: 67-43-6 Diethylenetriaminepentaacetic Acid Used as chelating agent and complexing agent Diethylenetriaminepentaacetic Acid (DTPA, ... min (Diethylenetriaminepentaacetic Acid, CAS: 67-43-6) is primarily used as a metal ion chelator. 2. DTPA 99%min ( ... others. DTPA, CAS: 67-43-6, Diethylenetriaminepentaacetic Acid, mainly used as chelating agent or complexing agent in textile industry