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. [Please select]
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Another point to be guarded against is the supply of water that has drained from marshes or impervious soils, rich in organic matter, as such water is charged with nitrites, ptomaines, etc. [Please select]
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