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Ammonium pertechnetate

Ammonium pertechnetate is a chemical compound with the formula NH<sub>4</sub>TcO<sub>4</sub>. It is the ammonium salt of pertechnetic acid. The most common form uses <sup>99</sup>Tc. 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:

HTcO<sub>4</sub> + NH<sub>4</sub>NO<sub>3</sub> → NH<sub>4</sub>TcO<sub>4</sub> + HNO<sub>3</sub>

It thermally decomposes under inert atmosphere at 700 °C to technetium dioxide:

NH<sub>4</sub>TcO<sub>4</sub> → TcO<sub>2</sub> + 2 H<sub>2</sub>O + 1/2 N<sub>2</sub>

Chemical properties

Passing hydrogen sulfide through acidic solutions of ammonium pertechnetate produces Technetium(VII) sulfide:

:

References