Chenta acid

Solutions of chromiumni salts, on being boiled with a solution of the disodium salt of l,2-diaminocyclohexane-N,N,N, N -tetraacetic acid (chenta acid), gives a reddish-violet solution. Under these conditions, dichromate solutions do not undergo reduction. This behavior is the basis of a spot test for chromiumjfii compounds in the presence of chromium . Cu, Co and Ni salts interfere because they form colored complexes with the reagent. 

Procedure. A drop of the test solution is mixed with a few eg of the disodium salt of chenta acid and then heated in a boiling-water bath for 5 minutes. A red-violet color indicates the presence of chromium salts provided Cu, Co and Ni salts are absent. 

---

See also in sourсe #XX -- [ ]

---