Ammonium pertechnetate is a chemical compound with the formula NH
4TcO
4. It is the ammonium salt of
pertechnetic acid. The most common form uses
99Tc. The compound is readily soluble in aqueous solutions forming
ammonium
Ammonium is a modified form of ammonia that has an extra hydrogen atom. It is a positively charged (cationic) polyatomic ion, molecular ion with the chemical formula or . It is formed by the protonation, addition of a proton (a hydrogen nucleu ...
and
pertechnetate
The pertechnetate ion () is an oxyanion with the chemical formula . It is often used as a convenient water-soluble source of isotopes of the radioactive element technetium (Tc). In particular it is used to carry the Technetium-99m, 99mTc isotope ( ...
ions.
Synthesis
It can be synthesized by the reaction of
pertechnetic acid and
ammonium nitrate
Ammonium nitrate is a chemical compound with the formula . It is a white crystalline salt consisting of ions of ammonium and nitrate. It is highly soluble in water and hygroscopic as a solid, but does not form hydrates. It is predominantly us ...
:
:HTcO
4 + NH
4NO
3 → NH
4TcO
4 + HNO
3
It thermally decomposes under inert atmosphere at 700 °C to
technetium dioxide:
:NH
4TcO
4 → TcO
2 + 2 H
2O + 1/2 N
2
Chemical properties
Passing hydrogen sulfide through acidic solutions of ammonium pertechnetate produces
Technetium(VII) sulfide:
::
References
{{Technetium compounds
Pertechnetates