Chemical Forums

Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: Alberto_Kravina on December 04, 2005, 04:16:33 AM

Title: Extracting Tetraethyllead from a leaded fuel
Post by: Alberto_Kravina on December 04, 2005, 04:16:33 AM
Is there a method to extract the tetraethyllead (Pb(C2H5)4) form an old (leaded fules are forbidden here in Austria) comercial gasoline in a shaking funnel? What would be the best solvent? I have to make an anlalysis of an old gasoline, and the first thing (according to what my teacher said) is extracing the lead in a separate layer. Thanks for any advice!
Title: Re:Extracting Tetraethyllead from a leaded fuel
Post by: Dude on December 19, 2005, 02:28:19 PM
I don't believe a conventional extraction would work.  Tetraethyllead is very organic soluble.  The partition coefficieint strongly favors tetraethyllead in an organic phase relative to an extractive solvent (ie water, acetonitrile or DMF).  A reactive extraction would probably be necessary (ie treat the leaded gasoline with an iodine monochloride solution or something to convert the lead into a water soluble material and then extract).