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Concept
Pertechnetate
Summary
The pertechnetate ion (p@r'tEkn@teit) is an oxyanion with the chemical formula TcO4-. 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 99mTc isotope (half-life 6 hours) which is commonly used in nuclear medicine in several nuclear scanning procedures.
A technetate(VII) salt is a compound containing this ion. Pertechnetate compounds are salts of technetic(VII) acid. Pertechnetate is analogous to permanganate but it has little oxidizing power. Pertechnetate has higher oxidation power than perrhenate.
Understanding pertechnetate is important in understanding technetium contamination in the environment and in nuclear waste management.
TcO4- is the starting material for most of the chemistry of technetium. Pertechnetate salts are usually colorless. TcO4- is produced by oxidizing technetium with nitric acid or with hydrogen peroxide. The pertechnetate anion is similar to the permanganate anion but is a weaker oxidizing agent. It is tetrahedral and diamagnetic. The standard electrode potential for TcO4-/TcO2 is only +0.738 V in acidic solution, as compared to +1.695 V for MnO4-/MnO2. Because of its diminished oxidizing power, TcO4- is stable in alkaline solution. TcO4- is more similar to PerrhenateReO4-. Depending on the reducing agent, TcO4- can be converted to derivatives containing Tc(VI), Tc(V), and Tc(IV). In the absence of strong complexing ligands, TcO4- is reduced to a +4 oxidation state via the formation of TcO2 hydrate.
technetium-99m generator
is conveniently available in high radionuclidic purity from molybdenum-99, which decays with 87% probability to . The subsequent decay of leads to either or . can be produced in a nuclear reactor via irradiation of either molybdenum-98 or naturally occurring molybdenum with thermal neutrons, but this is not the method currently in use today. Currently, is recovered as a product of the nuclear fission reaction of Uranium-235235U, separated from other fission products via a multistep process and loaded onto a column of alumina that forms the core of a / radioisotope generator.
Official source
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