This salt may be used for the separation of cobalt and nickel, since the latter metal does not form a similar double nitrite, but it is necessary that the alkaline earth metals should be absent, for in their presence nickel forms complex nitrites containing the alkaline earth metal and the alkali metal.
In the presence of anionic surfactants, 2 detected alkaline earth metal cations more effectively than alkali metal cations.
SAMARIUM [[[symbol]] Sm, atomic weight 150.4 (0= 16)1, a rare earth metal (see Rare Earths).
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