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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Hi Frank,
<br>
<br>
I would assume that you could treat RuO4 similar to OsO4, in which case, assume that it will react rather quickly once exposed to air. If the solution turns dark, then it should be discarded.
<br>
<br>
Upon opening a vial, you can make smaller aliquots of the 0.5% solution in eppendorf tubes and store them immediately at -20 C until needed. Thaw only those aliquots that you would need.
<br>
<br>
If you store the liquid solution in a fridge, it should be placed in a plastic, sealable container. It might be better to store the liquid in -20 aliquots as it will likely 'go off' overnight if stored at only 4C once the ampule has been opened.
<br>
<br>
Hopefully this helps. I admittedly, have not worked with RuO4, but chemically it sounds similar enough to Osmium tetroxide.
<br>
<br>
Best, <br>
<div><br>
<div style="font-family:Tahoma; font-size:13px">Kimberley Gibson<br>
<br>
Post-Graduate Associate, Charles Sindelar Lab<br>
<br>
Dept. Molecular Biophysics and Biochemistry<br>
Yale University<br>
SHMC-E15<br>
333 Cedar St.<br>
New Haven, CT<br>
06520-8024<br>
USA<br>
<br>
Lab (203) 737-4723<br>
Email: kimberley.gibson@yale.edu<br>
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<div style="direction: ltr;" id="divRpF634647"><font color="#000000" face="Tahoma" size="2"><b>From:</b> 3dem [3dem-bounces@ncmir.ucsd.edu] on behalf of Frank Polzer [frank.polzer@physik.hu-berlin.de]<br>
<b>Sent:</b> May 28, 2015 13:08<br>
<b>To:</b> 3dem@ncmir.ucsd.edu<br>
<b>Subject:</b> [3dem] ruthenium tetroxide<br>
</font><br>
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<p class="MsoNormal">Dear all,</p>
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<p class="MsoNormal">I recently purchased RuO4 in aqueous solution (0.5%) from EMS which comes in glass ampules.</p>
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<p class="MsoNormal">Can anyone tell me how long after opening the ampules the RuO4 can be used if being stored in dark and refrigerated?</p>
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<p class="MsoNormal">Also, do you have any suggestion what sort of secondary container one could use to store the opened glass ampules in the fridge?</p>
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<p class="MsoNormal">Thank you very much for your help in advance.</p>
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<p class="MsoNormal">Cheers,</p>
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<p class="MsoNormal">Frank</p>
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