Is there an easy way to separate unreacted Fe(0) from an old Fe(0) sample in powder form which has been exposed to atmosphere for some time?

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Vihanga Munasinghe

Iron in Zero oxidation state physically as a powder. MSDS of the compound can be found in the link below:

https://www.sciencelab.com/msds.php?msdsId=9924400

Sorry, i should have described it better.

Wont Fe(0) be oxidized to Fe2O3, when exposed to air ? and as Fe2O3 also show magnetic properties how to separate the two ?