I am a post grad student doing research currently. I deal with pure sodium metal cut into thin pieces (approximately 0.5cm by 0.5cm) and assemble them in half cells for testing. I am thinking of using acetonitrile as solvent for my electrolyte in my half cell but while dripping some acetonitrile on a piece of sodium metal in glovebox today, there appeared to be some black smoke fuming from the sodium piece and turned white thereafter. I did coloumetric titration tests and water content came back to be around 50 ppm. Hence i don't think its the water content but rather a reaction happening.
Any comments to this?