40 years since the discovery of the Arsenazo III reagent

The review was devoted to progress in the application of the well-known and widely used reagent Arsenate III in analytical chemistry. Arsenate III {2,7-bis[(2-arsonophenyl)azo]-1,8-dihydroxy-3,6-naphthalenedisulfonic acid} was synthesized by S.B. Savvin in 1959.