It is essential to define the domains of existence of each oxidation state, defined by the redox potentials of each couple. The potential values given below are expressed relative to a standard hydrogen electrode (V/ESH).
The reduction potential of the An
3+
/An couple is very negative, between -1.7 and -2.1 V depending on the actinide: an An actinide metal is oxidized in an acid solution to the An
3+
ion where it is dissolved :
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