Ammonium pertechnetate
Ammonium pertechnetate is a chemical compound with the formula NH4TcO4. It is the ammonium salt of pertechnetic acid. The most common form uses 99Tc. The compound is readily soluble in aqueous solutions forming ammonium and pertechnetate ions.
Synthesis
It can be synthesized by the reaction of pertechnetic acid and ammonium nitrate:
- HTcO4 + NH4NO3 → NH4TcO4 + HNO3
It thermally decomposes under inert atmosphere at 700 °C to technetium dioxide:
- NH4TcO4 → TcO2 + 2 H2O + 1/2 N2
Chemical properties
Passing hydrogen sulfide through acidic solutions of ammomium pertechnetate produces Technetium(VII) sulfide:
- 2NH4TcO4 + 7H2S + 2HCl → Tc2S7↓ + 2NH4Cl + 8H2O