Masking and colorimetric reagent for various metal ions. Precipitation reagent for lead, cadmium, selenium, bismuth and tellurium.

Terpyridine (2, 2';6', 2"-terpyridine, often abbreviated to Terpy or Tpy) is a heterocyclic compound derived from pyridine. It is a white solid that is soluble in most organic solvents. The compound is mainly used as a ligand in coordination chemistry. 2-6-2 Terpyridine was first synthesized by G.…